5/16-12X3/4 Unslotted Indented Hex Washer Self Drilling Screw Full Thread Black Zinc (Pack Qty 1,000) BC-3112KWBZ

Type BSD: May be used to attach plywood, soft woods or composition board to metal, or attach metal to metal. Type CSD: The finer thread pitch reduces friction and driving torques. Type-CSD screws are normally used with thicker materials. The wafer head design allows the screw to set flush in wood and softer materials and provides a clean, finished appearance All self-drilling screws offer economical benefits: reduces labor and tooling costs; reduces or eliminates drill bits and taps