0.315" x 6-1/4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Balusters and weathering for long-lasting durability

and weathering for long-lasting durability

Whether used in new construction

these screws combine corrosion protection with the strength needed to penetrate heavy-gauge steel

the Dagger‑Guard finish improves corrosion resistance

Flush Finish – Flat head with underhead nibs ensures smooth countersinking

0.315" x 6-1/4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Balusters and weathering for long-lasting durabilityThe 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.