Updated July 12, 2026: Included version with equalized holes and collar offsets. Largest still has "shelf," but all inner-most diameters now match.

Designed around the Milwaukee Shockwave 5pc set (includes 1/4", 5/16", 3/8", 7/16", and 1/2" nut driver inserts)

In my set, the 1/4" has a slightly smaller shank; the 1/2" has a slightly enlarged neck above the shank (the 1/4" bit shank is 7.1mm, whereas the others are 7.2; the neck of the 1/2" bit is 7.7mm x 4mm and then the shank is 7.2mm).

I've included the Fusion360 project archive so that you may change this if needed. As-is, this offers a relatively reliable hold and should keep the inserts neatly stored as long as you don't subject them to a ton of turbulence.

My printer nozzle got clogged literally 3 layers from the top of the print, which is why it looks kinda rough in the images. It'll be fine, though. This is me trying to convince myself, not you. It'll be fine.

Thinking about adding a small cover to protect from random metal filing buildup on the magnets, but it isn't that important to me at the moment. If someone wants it, I'll whip something up.