This 1/4 in. x 1 in. zinc-plated combo round head machine screw set is sold as a pack of 6, with a nut included for each screw. Machine screws are engineered for metal-on-metal fastening applications. They install easily with a screwdriver, which reduces the risk of over-tightening. Pre-drilling is recommended: drill a hole in the material that matches the diameter of the bolt before installing.