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0.195 x 10 Simpson Strong-Drive® SDWH Timber-Hex Screw Double-Barrier Coated - Box (50) 3/8-16 Hex Tap Bolts Silicon Bronze 1/4 x 1 1/4 Square0. 195 x 10 Simpson Strong Drive SDWH Timber Hex Screw Double Barrier Coated Box (50) . Ideal for structural and general purpose fastening applications where a hex head drive is preferred. The SDWH structural wood screws are ideal for the contractor and do it yourselfer alike. Features: Bold thread design that provides superior holding power Patented 4CUT tip that ensures fast starts, reduces installation torque and eliminates the need for pre