Lindstrom TKHWI-1000750US-500HD #10 x 3/4 in. External Hex Washer Head Self-Drilling Screw Zinc - Pack of 500

Has an indented top surface 6-flat sides with a flat washer which project beyond the sides and provides a flat bearing surface. Accepts hex wrench. A tapping screw with spaced threads and a drill point which drills its own holes. All self drilling screws offer economical benefits reduces labor and tooling costs reduces or eliminates the need for drill and taps. Zinc plated Material: steel Sold in packs of 500 5/16 in. hex drive Highly versatile Common project applications: roofing HVAC steel stud framing gutters and register vents