The Hillman Group The Hillman Group 41978 Round Head Combo Drive Machine Screw 10-24 X 1-1/4 In. 50-Pack Machine screws are used with nuts or screwed directly into a threaded receptacle to fasten metal parts together If nuts are needed, use with nuts of the same finish and threading for proper fit Fasten with a screwdriver to reduce the risk of over-tightening to protect the screw and fastened material