MGI SpeedWare 1/2" NPT Flexible Cable Gland, Spiral Pigtail Cord Grip Strain Relief (2-Pack)

Just the item you need to alleviate stress on a cord attached to electrical box.

Makes the the 4 way box safe and looks good

So far it's keeping the 4 conductor in a relaxed position.

Purchased for a power supply project. Easy to install. Just drill the hole, insert, and screw lock into place. Durable. Protects wiring into or out of kit.

This is a heavy duty cord exit. I over did it with this, I used it on a 14-2 wire that went into a Staples paper shredder, way overkill. I had to do some modification to get it to fit but it definitely did the job vs the original factory exit, which fell apart.

Made an extention cord and needed to make sure it would not pull out of the box. Easy to install.

I used these to make a GFI extension cord with USB C charging out of a 4" drawn box. These provide good strain relief but obviously be careful with rain if using a drawn steel box, as it's not exactly what it's designed for.

I ordered the wrong size and these did not fit into the pre-drilled holes in my electronics. So I didn't really get to use them. But it's very clear that these are exactly what I was looking for and would work great. I may try and modify them to get them to fine. As a strain relief product these look very good.