0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Bulk Loose Cement Board Screws Non-Expansive Tip Design: Helps prevent

Non-Expansive Tip Design: Helps prevent cracking in close-to-edge and reduced spacing applications

chemical-exposed

making it suitable for treated wood and outdoor exposure

and metal buildings

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

0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Bulk Loose Cement Board Screws Non-Expansive Tip Design: Helps preventThe 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.