Is one of the bits good for making a Flat bottom ?

Yes, the cylindrical shapes burrs in the kit can make a flat bottom.

Can these 1/4 inch shank burrs be inserted into the 1/4 inch collect of Milwaukee M12 easily?

Our 1/4 inch shank burrs can be inserted into rotary tool's 1/4 inch collect easily, Such as Milwaukee,Ingersoll Rand,DEWALT,Makita,etc.

does it provide any clear info what each bit is for? i wouldn't know which is for wood, plastic, metal, etc.

There are no instructions at all. I am a retired tool & die maker. I use them for working on metal. These will work on any kind of metal including hardened steel. You don't need carbide for wood or plastics but these will work on them. You will need to clean them frequently. I don't recommend using these for gems as one person enquired about. Gems are harder than hardened steel and most are harder than carbide tools.

Does this work on stainless steel and mild steel?

My set worked great on mild steel and should work as well on stainless steel.

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Description

⚡ Sharpen your craft with precision power – don’t get left behind!

DOUBLE CUT DESIGN - Delivers finer finishes with reduced chip size, perfect for professional-grade deburring and engraving.
ALL IN ONE 10 PIECE SET - Includes varied head shapes (ball, cylinder, flame, oval) for carving, grinding, polishing & sculpting.
ERGONOMIC LOW VIBRATION - Comfortable control with less noise and vibration, making extended use effortless and precise.
UNIVERSAL 1 4 SHANK COMPATIBILITY - Seamlessly fits top brands like DeWALT, Milwaukee, Makita & more for versatile tool pairing.
PRECISION ENGINEERED TUNGSTEN CARBIDE - Ultra-durable burrs with HRA90 hardness for long-lasting sharpness and aggressive material removal.

The Sworker Carbide Burr Set features 10 high-grade tungsten carbide bits with a 1/4" shank, engineered for compatibility with leading die grinders. Designed for aggressive yet precise cutting, its double cut style ensures smooth finishes across metal, wood, stone, and more. With a max speed of 60,000 RPM and a variety of head shapes, this set is ideal for professionals seeking versatile, durable rotary tools for deburring, engraving, polishing, and shaping.

Specifications

Material	Tungsten Carbide
Cutting Diameter	10 Millimetres
Finish Type	Polishing
Shank Type	Straight Cylindrical
Cutting Angle String	90 Degrees
Brand	Sworker
Item dimensions L x W x H	10.2 x 8 x 1.4 Centimeters
Tool Flute Type	Spiral
Point Style	Cross Point
Surface Recommendation	Metal
Number of Flutes	10
UPC	787022948731
Net Quantity	10.0 Count
Manufacturer	Sworker
Number of Pieces	10
Country of Origin	USA
Model number	CBS-5
Colour	Silver Grey
Number of Memory Sticks	10
Special Feature	Easy to Install
Specific Product Use	Grinding, deburring, cutting, shaping, porting on metal, steel, aluminum, wood, stone. Works with die grinders and rotary tools. Ideal for metalworking, fabrication, carving, and tool maintenance.
Item Weight	231 g
Product Dimensions	10.21 x 7.95 x 1.45 cm; 231 g
Item model number	CBS-5
Item Height	0.57 Inches
Item Width	3.13 Inches
Power Source	Best in Rotary Collet Tools (High Rpm). Poor in Low-rpm Drills/Drill Presses.
Included Components	10 pcs 1/4" burrs, 1 slotted plastic clamshell box, 1 manual and 1 paper box.
Are batteries included?	No

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