0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Bulk Loose Cement Board Screws G90 Galvanized Coating: Provides corrosion

G90 Galvanized Coating: Provides corrosion resistance suitable for indoor and dry-use environments

making it suitable for treated wood and outdoor exposure

chemical-exposed

Heavy-Gauge Steel Construction: Built for high-strength load-bearing performance

1/4-14 x 7/8" Stitch HWH Steelbinder self-drilling pole barn screws are designed for general metal to metal construction applications

0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Bulk Loose Cement Board Screws G90 Galvanized Coating: Provides corrosionThe Simpson Strong Tie Strong Drive SDHR Combo Head Screw is made for serious wood projects like cross laminated timber (CLT), mass timber, and other big framing jobs. The unique combo head design gives you flexibility, with a choice to drive it with either a hex bit or a T40 6 lobe bit. A knurled shank helps lock the screw in place, and the sharp Type 17 point starts fast, reduces driving torque, and often eliminates the need for predrilling.