Anti Roll Cap for Hex Driver

I love these hex drivers, but they didn't grind a flat spot in the handle so they have a tendency to roll off the table. Pop one of these caps in and they stay put. I put the tab on top so you can pull it out with pliers if needed.

This cap is a 14.15mm diameter. Tinkercad link if you want to change the design: https://www.tinkercad.com/things/4VIUbBgydUI