Simpson #12 x 2-1/2" Strong-Drive DWP WOOD Screw Flat Head, 305 Stainless SteelModel No. S12250WP Coating Material. Type 305 Stainless Steel Penny size. #12 Length (in.) 2 1 2 Head Diameter (in.) 3 7 Drive Type. T27 6 Lobe Head Type. Flat Head Thread Type. Box Threads Point Type. Sharp Point Approx. Count per Lb. 56 The Strong Drive DWP Wood SS screw with its specially designed sharp point and unique box threads is a powerful, load rated fastening solution for exterior engineered structural connections, such as on docks,