The design is based on the premise that screwdrivers need grip force in order to function properly, by focusing this force on your wrist/forearm instead of your hand it enables people with limited use of their hands to use screwdrivers without a problem. 

It includes standard hexagonal bit size, for easy changes of bits.

Printed with PLA  1.75mm, 2mm height, 50% infill at 205 C