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Profile: GRK Fasteners is a manufacturer and supplier of multipurpose screws & fasteners. Our product includes R4® multi purpose screw, Pan® head screw, RSS® LPS panel frame, Cabinet® screw, Calliburn® XL concrete screw, MSS® zip tip metal siding, Tip star® shim screw, and tools & bits. Our products include bit holder, bits, screw guide, bit changer, and bit box. The R4® includes self-countersinking screw has a new under head with saw-blade like cutting teeth and six self-contained cutting pockets. Together these features act like a circular saw blade, transporting the drill dust away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment. The Cabinet® screws are used in cabinet construction and installation.