The Hillman GroupThe Hillman Group 35247 Hex Washer Head White Self-Drilling Screw 8 x 9/16 100-Pack They are used in wood, fiberglass and metal Self-drilling or self-tapping metal screws increase productivity by reducing the number of steps required to screw together pieces of metal White finish The self-drilling screw possesses a drill point enabling it to drill in its own hole in thin gauge steel