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#12-24 x 1-1/2" Hex Washer Head Self Drilling Screw, Tek 5 Point, Steel, Zinc Plated (Package of 50). This screw is intended for attaching metal to metal. Tek Screws are a type of self-tapping screw that are designed to drill a hole and tap their own threads simultaneously, saving the installer the time of pre-drilling the holes where needed. Drill Capacity (.125" - .500") Recommended Drill Speed (1500) ICC ES Evaluation Report: ESR-3528 **Meets ASTM C 1513 for cold-formed steel framing connections. **Meets F.I.P.-1000.7 for torsional strength & drill speed **Meets SAE J78 for performance & dimensional specifications **Meets ASTM F1941 for corrosion resistance **Meets ASTM A 510 for carbon steel manufacturing