This is a handle for extended screwdriver bits with cap. There are two type of caps - for "short" bits 50 mm and "long" 65 mm, body is the same for all cases. You can print 65 mm version for both types. Cap is help to carry screwdriver in poket or in bag without chances to destroy something.

It is recommended to glue in a small 4 mm magnet in body for best fixation of bits. And sand body with sandpapaer after printng.