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#10-16 x 3-1/2" Phillips Bugle Head Tek screws, Zinc Plated These 3 1/2" length #2 Phillips drive Bugle Head ZINC PLATED Self-Drilling screws are #10-16 (16 threads per inch) #2 Point. Zinc plated is a plating that is applied electrically to fasteners that prevents oxidation of steel by forming a protective barrier. Meets F.I.P.-1000.7 for torsional strength and drill speed. Meets ASTM A 510 for carbon steel manufacturing. Meets ASTM C 954 for attaching gypsum board to steel studs. Zinc plating meets ASTM B-117 for salt spray corrosion. Each box contains approximately 1,000 screws (17 pounds)Product image is a likeness. Actual screw is not shown. Some screw lengths beyond 1-5/8" may follow the industry standard 2/3 partial thread length rule. Contact us if Full Thread is required for lengths beyond 1-5/8". Manufactured according to I.F.I. Standard. Applications Include:Attaching gypsum, drywall, insulation, and wood to metal, drill capacity .035 - .110, drill speed 2500 RPM.