#10-16 x 1-1/2" Star drive Wafer Head Tek screws, Zinc Plated Features:Self-Drilling for plywood to metal applicationsPrecision cutting drill point delivers high performance with less physical effort.Low corrosion resistance Details:Head Type: WaferDrive Type: T25 StarThread Diameter: #10Threads Per Inch: 16Length: 1-1/2"Point: #3 Self-DrillingQuantity: 2,000 pcsWeight: 22 pounds [approx.] Material Application:Attaches plywood to metalWood Range: 1/4†- 1â€Drill Capacity: .035 - .176Drill Speed: 2500 RPM Specifications:Meets F.I.P.-1000.7 for torsional strength & drill speedMeets SAE J78 for performance & dimensional specificationsMeets ASTM A 510 for carbon steel manufacturingMeets ASTM F1941 for corrosion resistanceZinc Plated Zinc plated is a plating that is applied electrically to fasteners that prevents oxidation of steel by forming a protective barrier. Not recommended for ACQ Treated Lumber.