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HK 55 and HKC 55
blade cuts at both 45 deg and 90 deg angles for clean and effortless flush cuts
they are less resistant to rusting
so the numbers don't wear away
to make it easy to distinguish just by feel
GRK Fasteners RSS 10235 Structural Screw, 5/16 in Thread, 6 in L, Washer Head, Star Drive, Steel, 300 BX Clamps / Fastening Tools HK 55 and HKC 55GRK's RSS screw is 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. RSS screws that are 3 1 8 in and longer have CEE threads which enlarge the screw hole for the non threaded portion of the fastener, allowing the wood to settle easily and increases the screw's drawing