#8-18 x 2-1/4" Phillips Flat Head w/Nibs and Wings, Self-Drilling, Fiber Board Screw, Ruspert Coating Features:Approved for ACQ Pressure Treated LumberCeramic coating provides protection from corrosionNibs under head clamp board firmlyWings ream hole in board preventing “jacking action†Details:Drive Type: #2 PhillipsHead Type: FlatThread Diameter:#8Threads per inch: 18Thread Type: FineLength: 2-1/4"Point Type: #2 Self-Drilling with WingsDrill Cap (in.): .035 - .100Drill Speed: 2500 RPMQuantity: 3,000 pcsWeight: 30 pounds (approx.) Applications:Attaches fiber board to metal studs. Specifications:Meets F.I.P.-1000.7 for torsional strength & drill speedExceeds 1,000/hr. salt spray resistanceRuspert Coated Ruspert coating is a high-grade metal surface processing technology that prevents corrosion. The coating system consists of three layers; a metallic zinc layer, a high-grade anti-corrosion chemical conversion film, and a baked ceramic surface coating. Ruspert Coating meets ASTM B-117 for salt spray corrosion exceeding 1,000/hrs salt spray resistance. ACQ compatible.