This contractor pack includes 450 GRK Fasteners R4 multi-purpose screws designed for wood, plastic, and composite materials. These #10 x 4-inch screws feature a star drive bugle head for countersinking and a self-tapping thread for quick installation without pre-drilling. Built for heavy-duty use, the R4 screws provide high-tensile strength and a climatek coating for corrosion resistance in various hardware and building applications

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