Simpson #8 x 1-1/4" Collated FHSD Wood-to-CFS Screw Flat Head 2500-PkModel No. FHSD114S0818 Coating Material. Yellow Zinc Coated Screw Size. #8 Length (in.) 1 1 4 Head Diameter (in.) 0. 310 Drive Type. #2 Square Head Type. Flat Head TPI. 18 Max. Grip Length (in.) 0. 858 Point Type. Drill Point Point Size. 2 Compatible Tools. Quik Drive PRO200G2, PRO200SG2 Packaging Qty. 2500 Use this screw for wood or wood structural panel sheathing to cold formed steel (recommended max. steel thickness: 3 16"). Key Features Flat head