#10-16 x 1-1/2" Phillips Flat Head Tek screws, Zinc Plated These 1 1/2" length #2 Phillips drive Flat Head ZINC PLATED Self-Drilling screws are #10-16 (16 threads per inch) #3 Point. Zinc plated is a plating that is applied electrically to fasteners that prevents oxidation of steel by forming a protective barrier. Flat head style is ideal for countersunk holes. Meets F.I.P.-1000.7 for torsional strength and drill speed. Meets ASTM A 510 for carbon steel manufacturing. Zinc plating meets ASTM B-117 for salt spray corrosion. Each box contains approximately 4,000 screws (37 pounds)Applications Include:For countersunk holes attaching metal to metal, drill capacity .035 - .176, drill speed 2500 RPM.