Question

The handle of a watch-makers screw driver is thinner than the handle of a carpenter’[s screw driver. Why?​

Answer 1

Answer:

to handle it perfectly, but the size of nut must be small for adjusting so the tip of screw driver is as per the size of nut.

Explanation:

This is variously attributed to improving grip or preventing the tool rolling off the bench. The shape has been popular for a couple of hundred years. It is usually associated with a plain head for slotted screws, but has been used with many head forms.