Simpson #8 x 3" Collated WSTD Roofing Tile Screw 1000PkModel No. WSTD3S Coating Material. Exterior Grade Coating Screw Size. #8 Length (in.) 3 Head Diameter (in.) 0. 333 Drive Type. #3 Square Head Type. Flat Head Thread Type. Twin Threads Thread Length (in.) 2. 172 Point Type. Sharp Point Compatible Tools. Quik Drive PRO300SRFG2 Packaging Qty. 1000 The WSTD is designed to work with Simpson Strong Tie Quik Drive auto feed screw driving systems. This screw is ideal for connecting roofing tiles to wood. The