The Hillman GroupThe Hillman Group 35293 Self-Piercing Sheeters Screw White 10 x 1 35-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 finished screws And the self-drilling screw possesses a drill point enabling it to drill in its own hole in thin gauge steel