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14 Robertson (square) drive flat head silicon bronze screws have cut threads and the full-bodied diameter shank desired by boatbuilders.
Unlike rolled thread screws with their reduced shank, these screws have a shank diameter that is the same size as the outside of the threads. This completely fills the clearance hole normally drilled for the shank thus creating a waterproof seal. These wood screws have a square drive recess to help prevent cam out.