#8-18 x 1" Phillips 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: #2 PhillipsThread Diameter: #8Threads Per Inch: 18Length: 1Point: #2 Self-DrillingQuantity: 8,000 pcsWeight: 38 pounds [approx.] Material Application:Attaches plywood to metalWood Range: 1/4†- 1/2â€Drill Capacity: .035 - .100Drill Speed: 2500 RPM Specifications:Meets ASTM C 1513 for cold-formed steel framing connectionsMeets 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.