Simpson 0.220 x 4-3/8" Strong-Drive SDW TRUSS-PLY interior Wood Screw - E CoatModel No. SDW22438 Coating Material. E coat Electrocoating Length (in.) 4 3 8 Head Diameter (in.) 0. 760 Shank Diameter (in.) 0. 220 Drive Type. T40 6 Lobe Head Type. Low Profile Head Thread Length (in.) 1 3 8 Point Type. SawTooth Point The Strong Drive SDW Truss Ply screw is a high strength structural wood screw specifically designed for fastening multi ply wood members, such as joining plated trusses and solid sawn lumber. The SDW installs easily