The screwdriver tool rotates slotted head screws with a straight diagonal hole in the head, and standard flathead screwdrivers of various sizes are used. Manual or automatic screwdriver tool, used to tighten and loosen screws. A simple screwdriver has a handle and a shank that ends in a tip that the user places on the head of the screw before turning the handle. The shaft is usually made of strong steel to resist bending or twisting. The screwdriver consists of four parts: 1) the handle, 2) the shank, 3) the blade, 4) the tip.