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GRK Fasteners 5/16 in. x 4 in. Star Drive Round Head Rugged Structural Wood Screw (45-Piece per-Pack) 112225 - The Home Depot
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GRK Fasteners 772691-12221-6 $62.37 - #5/16 x 3 1/8"L RSS Rugged Structural Screw, Handy Pak (100 Pieces)
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