The self-tapping screws are made of great quality steel They have a good strength of extension, corrosion resistance, superior rust resistance and excellent oxidation resistance, which can ensure a long time using The compact thread is not easy to out of shape and slid in the process of rolling, avoiding screws being loosed effectively and provide good holding power Flat head design, ideal for use in confined areas where the head needs to be flush or below the surface Flat head screws suitable for home and office appliances, wood furniture, repair and inventions, and other machinery industry, fixing components, industrial and construction fasteners, and so on Ideal tool for professionals, amateurs, repairmen, woodworking, etc.