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ITW GRK RSS Rugged Structural Screws. Made of specially hardened steel to provide you with high tensile, torque and shear strength. The sharp threads and points bite instantly into the material (including hardwood), reducing the splitting effect due to smaller shanks. Recessed star drive zero stripping with six points of contact, Cee thread enlarges hole to reduce splitting, washer head for immense holding power, plus many more great features.