The Hillman Zinc Flat Head Phillips Machine Screw is used with nuts or screwed directly into a threaded receptacle to fasten metal parts together. Fasten the machine screw with a screwdriver to reduce risk of over-tightening to protect the screw and fastened material. If nuts are needed, use these flat head machine screws with nuts of the same finish and threading for proper fit. Measured from the underside of the head to the tip of the screw to obtain fastener length Use for any indoor or outdoor projects 1/4 in. x 2 in. machine screw Engineered to fasten metal parts together Nut of the same finish and threading is included for proper fit Flat head slotted drive for ease of use Fasten with a screwdriver to reduce the risk of over-tightening 5 flat head machine screws per pack