摘要
Self-drilling screw bolts are a new product to replace ordinary screw bolts, and thus raise working efficiency ten times and reduce the cost of installation. According to the design theory of integrating drilling bit with driving screw, the self-drilling screw bolt can complete successively the functions of drilling, screwing and fastening within several seconds, with the aid of a simple jig alone. This serves the development of board installations in room decoration and vehicle and ship building.
