Simpson 0.155 x 4-1/2" SDWC TRUSS Structural Screw, E Coat, 50ctModel No. SDWC15450 KT Coating Material. E coat Electrocoating Length (in.) 4 1 2 Head Diameter (in.) 0. 335 Shank Diameter (in.) 0. 155 Drive Type. T30 6 Lobe Head Type. Cap Head Thread Length (in.) 4 1 4 Point Type. Type 17 Point Color. Black Packaging Qty. 50 Strong Tie SDWC Truss Plate Structural Screws feature a fully threaded shank, providing a secure connection between the roof and wall framing members. Simpson SDWC screws can be installed from