Attach drywall or wallboard to metal or wood studs and joists without the need for pre-drilling. Self-tapping screws feature a thick shank,deep threads and a very sharp point. With a #2 Phillips driver, the countersunk bugle head won’t tear the surface paper of the drywall. Fine thread is for drilling into metal studs, use coarse thread for wood studs. Made of steel with black phosphate finish. Imported.