1. Speed preselection with setting dial 2. 8 torque setting + max torque setting and 20N.m 3. Big torque gear box A screwdriver is a tool for driving screws or bolts with special slots, and sometimes for rotating other machine elements with the mating drive system. The screwdriver is made up of a head or tip, which engages with a screw, a mechanism to apply torque by rotating the tip, and some ...