Screwing two parts of a machine is considered better than sticking them together using an adhesive or nails as it leaves a little space for customization and repair should something go wrong. The grooved head of the Homesmiths Machine Screws make it easier for anyone to unscrew them and pull them out using a screwdriver. Since all the screws are of the same diameter and 2-inch range, you dont have to remember which screw was for which exact hole. .(1)Easily screws into pre-threaded holes of the same size.(2)Durable and long-lasting screws made from high quality materials.(3)Great to be used with appliances and machinery.(4)Uniform design allows you to use the screw interchangeably..