---
product_id: 10888061
title: "Combination Set with Square, Center and Non-Reversible Protractor Head and Blade - 12\" Blade Length, Cast Iron Heads, Hardened Steel, 4R Graduation Type - C9-12-4R"
brand: "starrett"
price: "€ 711.74"
currency: EUR
in_stock: true
reviews_count: 5
url: https://www.desertcart.nl/products/10888061-combination-set-with-square-center-and-non-reversible-protractor-head
store_origin: NL
region: Netherlands
---

# 12-inch hardened steel blade 0-180° dual-direction protractor Lockable, adjustable square head Combination Set with Square, Center and Non-Reversible Protractor Head and Blade - 12" Blade Length, Cast Iron Heads, Hardened Steel, 4R Graduation Type - C9-12-4R

**Brand:** starrett
**Price:** € 711.74
**Availability:** ✅ In Stock

## Summary

> 📐 Master every measurement like a pro — precision that commands respect!

## Quick Answers

- **What is this?** Combination Set with Square, Center and Non-Reversible Protractor Head and Blade - 12" Blade Length, Cast Iron Heads, Hardened Steel, 4R Graduation Type - C9-12-4R by starrett
- **How much does it cost?** € 711.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/10888061-combination-set-with-square-center-and-non-reversible-protractor-head)

## Best For

- starrett enthusiasts

## Why This Product

- Trusted starrett brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Crafted from hardened steel and cast iron heads, designed to withstand the toughest job sites.
- • **Rock-Solid Stability:** Lockable square head with a custom bolt ensures unwavering measurement reliability.
- • **Precision in Every Angle:** Dual graduation protractor for instant, accurate angle readings from 0 to 180°.
- • **Centering Made Effortless:** Specialized center head attachment locates exact centers on round or square objects with ease.
- • **Versatility for Every Pro:** Ideal for toolmakers, mechanics, carpenters, and DIY pros craving precision and durability.

## Overview

The Starrett Combination Set C9-12-4R features a 12-inch hardened steel blade with cast iron heads, including a lockable square, center locator, and a dual-direction protractor with 4R graduations. Engineered for professionals and serious DIYers, this certified frustration-free tool delivers unmatched accuracy, durability, and versatility across all your measuring and layout tasks.

## Description

The Starrett 12" Combination Set with Square, Center, and Non-Reversible Protractor Head and Blade includes a reversible lock bolt, scriber, and spirit level in both square head and protractor head. The combination square includes a hardened steel graduated rule and movable combination square and miter head with spirit level and scriber. The square head has a precision ground 90° square face and a 45° miter face. It is an effective tool for scribing right angles and parallel lines, and a measuring tool that can be used as a tri-square, miter, depth gage, height gage, and level. The Center Head is an available attachment that provides an easy means of accurately locating the center of cylindrical or square work. The Protractor Head is another available attachment. It has revolving turrets with direct-reading double graduations, a full 0 to 180° in opposite directions. This permits accurate and quick direct reading of angles above or below the blade. The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments, and Saw Blades for industrial, professional, and consumer markets worldwide. Starrett, a manufacturer of fine precision tools in the industry for over 130 years.

## Features

- Easy to Use - The square head can be moved up and down on the rule with a lockable assembly and a specially designed bolt to engage the slot for stability and versatility while measuring.
- Perfect Attachment - The Center Head is an available attachment that provides an easy means of accurately locating the center of cylindrical or square work.
- Get Accurate Measurements - The protractor head has revolving turrets with direct-reading double graduations, a full 0 to 180-Degree range in opposite directions which permits accurate and quick direct reading of angles above or below the blade.
- Complete Quality Made Tool - The set includes the rule, square, protractor, and center heads that are made from durable hardened steel, which can withstand even the most strenuous jobs. It's perfect for any construction project or DIY task.
- Versatile Layout Tool - Starrett squares are offered in a practical variety of styles to suit the needs of the individual, whether it be a toolmaker, mechanic, carpenter, or a "do-it-yourself" homeowner.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Starrett |
| Part Number | C9-12-4R |
| Item Weight | 2 pounds |
| Product Dimensions | 1 x 1 x 1 inches |
| Item model number | C9-12-4R |
| Is Discontinued By Manufacturer | No |
| Size | 11 Inches & Above |
| Color | silver |
| Style | Square |
| Material | Steel,Iron |
| Item Package Quantity | 1 |
| Measurement System | Inch |
| Certification | certified frustration-free |
| Batteries Included? | No |
| Batteries Required? | No |

## Product Details

- **Material:** Steel,Iron
- **Brand:** Starrett
- **Color:** silver
- **Style:** Square
- **UPC:** 049659500462

## Images

![Combination Set with Square, Center and Non-Reversible Protractor Head and Blade - 12" Blade Length, Cast Iron Heads, Hardened Steel, 4R Graduation Type - C9-12-4R - Image 1](https://m.media-amazon.com/images/I/51D9bVbdepL.jpg)

## Available Options

This product comes in different **Model** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Expensive, Useful
*by F***T on November 15, 2014*

I primarily use the Starrett C434ME-300 kit for furniture making and wish I had bought it sooner. I had been getting by with a somewhat less expensive combination square made by Empire. I like my Empire stainless and aluminum combination square very much, but this Starrett set includes a protractor head which is indispensable in many situations.One of the other reasons I like this set from Starrett is that they manufacture interchangeable heads and rules. For example, I purchased a compatible 600 mm rule, separately, that can be used with the three heads included in this kit.Another reason I like this Starrett set is that the heads are reversible relative to the orientation of the rule. The clamping pin in the Starrett mechanism has a round perimeter and can be rotated to the opposite side of the head. The other combination square I often use, by Empire, has a reversible square pin design (the pin must be completely removed from the head and reinserted to switch sides). I tend to swap rules more often than I swap sides, so I favor the square pin design on the Empire because it does not rotate out of position unintentionally; but both designs have merit, depending on how you use the tool most. I do wonder if Starret's round pin design can be manufactured more accurately or will wear better over time? I don't know. For quick and dirty tasks, I keep going back to my Empire combination square, but for everything else, especially odd angles, I use this Starrett kit.At the time of my purchase, Starrett offered three different sizes of heads/rules, so if you intend to mix and match, study Starrett's product catalog carefully to make sure you don't end up with incompatible items. Starrett also offers rules in a couple of different metals/finishes. I personally prefer the satin chrome, for legibility and resistance to corrosion, even though the satin finish tends to reveal cosmetic blemishes that accumulate with use.One thing I didn't think about until after I received and started using this kit was the importance of being able to accurately set the compass head to the same angle, over and over again. Ideally, one might leave the compass head set in position for the duration of a project, but due to operator error and having only one kit to work with, I discovered that I've been able to reset the compass head to the same angle fairly accurately. Your mileage may vary, and if this will be an issue in your work, you may want to reflect upon your budget and whether you need to buy several instances of the same tool, so that you can proceed without ever changing the setting of the square/compass. For the accuracy that I require, I've been happily surprised by the repeatability that I can achieve with this Starrett set.To my recollection, I was disappointed that Starrett did not offer a better selection of metric rules. I prefer to work almost exclusively in metric, and sometimes the combination metric/imperial rules that Starrett makes end up being in an obnoxious orientation for the task at hand, such that the metric measure cannot be judged without re-orienting the rule or the tool. Unfortunately, there must not be enough demand for Starrett to manufacture pure-metric rules?When this set was new, I found the fit of the parts a little too snug, which made swapping rules slightly uncomfortable, but the parts have since loosened up very slightly, to a comfortable level. Presumably the microscopic peaks left on the parts during manufacture have been knocked down, so they are no longer interfering.This kit comes in a convenient storage box with form-fitting foam inserts, but if you buy additional rules/heads, you're going to need something more. For example, I still haven't gotten around to building anything that can accommodate my 600 mm rule, and I feel slightly anxious leaving it exposed on the workbench when it is not in use. So while you're at it, you may want to give some thought to how you're going to store these expensive tools.

### ⭐⭐⭐⭐⭐ Quality and accuracy is still there.
*by T***. on April 21, 2025*

Before college, I worked in the family business. Wood dimension tolerances of plus-or-minus 0.001". Occasionally to 0.0001" (yes, you can work wood to tolerances of one ten-thousands of an inch.) I have great respect for Starrett. The tools never let us down.

### ⭐⭐⭐⭐⭐ The best, and worth every cent
*by L***S on July 25, 2004*

You can spend your money on the cheaper Empire or Stanley combo squares available at Home Depot/Lowes. You'll then spend the rest of your time squinting trying to read the things. The satin chrome finish on the Starrett rules make them worth twice their cost. Glare-free, easy-to-read, and exceptionally accurate, these Starrett tools are lifetime tools. Look on Ebay, and you'll see Starrett squares that are 50+ years old going for top dollar. These are the finest squares available.As a cabinetmaker, I use my Starrett squares for layout work all day, every day. Of all my hand tools, this square has brought me the most unqualified performance and enjoyment of any tool I own. The action is smooth, the gradients on the rule and protractor are precise and clear, and the quality is beyond compare. This is typical of all Starrett products. Starrett is not flashy and not given to gimmicky marketing tricks. They just produce top quality tools. Period. Precise measurements and layouts make all the difference in woodworking and machining, and you will get what you pay for. I would recommend any Starrett product.For maximum versatility, consider purchasing a 24" rule to go with your square (McMaster-Carr, $73). It is interchangeable with the 12" rule supplied with this kit. It allows extra measurement range and I use mine almost exclusively. You might also consider getting a smaller square, like a 6". Experiment with your squares, and you'll be amazed at everything you can do with them. You can measure inside dimensions of cabinet openings, run parallel lines, and a million other things. Easily the most useful tool you'll ever own. What else can I say? Starrett is good old American quality built in Massachusetts. Yankee ingenuity at its best.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.nl/products/10888061-combination-set-with-square-center-and-non-reversible-protractor-head](https://www.desertcart.nl/products/10888061-combination-set-with-square-center-and-non-reversible-protractor-head)

---

*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-18*