Gridfinity 2x2 screwdriver 4mm hex bit holder stackable version

This is a remix of the gridfinty 6.35 mm hexbit holder that's still 2x2 and 6 units high but holds 100 of the smaller 4 mm hex bits. I've added a second model that now includes a remix where one side is the normal 6.35 mm hex bits and the other side is the 4 mm hex bits.