ofter material as the screw is inserted. The most commonuses of screws are to hold objects together and to position objects.A screw will almost always have ahead on one end which contains a specially formed shape that allows it to be turned, or driven, with atool. Common tools for driving screws include screwdrivers and wrenches. The head is usually largerthan the body of the screw, which keeps the screw from being driven deeper than the length of thescrew and to provide a bearing surface. There