Strong-Point Self-Drilling™ Self-Drilling Screw, 5/16-12 Thread, 1 in Overall Length, 7/16 in Head, Unslotted, Indented Hex Washer with Locking Serration Head, 7/16 in Drive, Socket Drive, 0.06 to 0.22 in Drill, #3 Point, Finish: Zinc-Plated, Additional Information: 7/16 in Width Across Flat