A wall-mounted holder for the Nogarmy cordless mini pen drill (available on Amazon). It holds the drill, its wrenches, and either 10 or 20 3/32" shank bits or cutters. You can also use it on the workshop table, but it needs to be mounted on a heavy base so it doesn't tip over.
If you are in the market for a mini pen drill, the Nogarmy drill is much better than the WowStick drill. It has a metal chuck that holds the drill with much better concentricity. Don't buy a WowStick, buy a Nogarmy.