Makers Bolt external hex washer head self-tapping drill point screw for secure fastening and greater holding power. This fastener taps its own own threads through metal or wood, eliminating the need to pre-drill. The black ruspert coating provides 2x the corrosion protection compared to a galvanized fastener making it an excellent choice for exterior or interior applications. The carbon steel inner material is stronger than stainless steel. High quality material, drill point, and finish, made in Taiwan.