Precision Bit Adapter - 4mm bit to 1/4" (Regular drill bit Size)

I made this so that I could quickly open up small electronics with a handheld power screwdriver.
closedbottom4mmaadapter4.stl is tight on the bit.
closedbottom4mmadapter3.stl is a little loose on the bit.
Both of these. ^^^^^ Were Printed using .4mm Nozzle.

closedbottom4mmadapter6.stl
^^^ Print with this one if you have a .2mm Nozzle. This for me seems like an absolute perfect fit.

Feel free to let me know how you make out.