These #10-24 x 1/2 in. Phillips flat head machine screws are supplied as a box of 100. They have a machine-cut thread throughout the length of the shank. Fasten with a Phillips screwdriver to reduce the risk of over-tightening and to protect the screw and the fastened material. If nuts are needed, use nuts of the same finish and threading for proper fit. They can be used for indoor or outdoor projects.