0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Cross-Laminated Timber Screws Made from heavy-gauge steel and

Made from heavy-gauge steel and engineered to meet load requirements in today's most complex structural environments

while the larger-diameter upper shank provides more shear resistance and successful installation

and industrial installations

and plumbing systems

and a clean finish

0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Cross-Laminated Timber Screws Made from heavy-gauge steel andThe 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.