Diameter: #10 Length: 1-1/2 Material: Steel Finish: Painted Red Head Style: Hex Washer (1/4 Hex) Point Type: Drill Thread Size: 14 Thread Length: Full Style: With Bonded Washer Type: Self-Drilling Screw Application: Pole Barn|Treated Lumber A self-drilling screw or tek screw is similar to a sheet metal screw but it has a drill-shaped point to cut through the substrate to eliminate the need for drilling a pilot hole. Ideal for any project involving light gauge sheet metal awnings door and window frames gutters sheds.