Simpson 0.390 x 7 7/8" Strong-Drive SDCP TIMBER-CP Screw T40, Yellow ZincModel No. SDCP27778 Finish. Yellow Zinc Coated Length. 7 7 8 Head Diameter (in.) 0. 7 Shank Diameter (in.) 0. 275 Drive Type. T40 6 Lobe Head Type. Flat Head with Nibs Thread Length (in.) 3 1 8 Point Type. Type 17 Point The Strong Drive SDCP Timber CP screw is a structural fastener available in a variety of lengths and is designed for cross laminated timber construction, mass timber construction and general interior applications. These partially