The GRK Rugged Structural Screw Made of PHEINOX™ hardened Stainless Steel. Lifetime warranty against staining and rusting. Self-tapping, W-Cut™ thread design, GRK’s RSS™ Rugged Structural Screw is made of specially hardened steel to provide you with high tensile, torque, and shear strength.
- Pheinox R4 5/16 Screws require a T-30 bit
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