0.315" x 4" Strong-Drive SDHR Combo-Head Screw - Zinc, Pkg 25 Bulk Loose Cement Board Screws Type 316 stainless steel -

Type 316 stainless steel - for maximum corrosion resistance in tough outdoor conditions

making it suitable for treated wood and outdoor exposure

Material and Finish: Made from 316 Stainless Steel for durability

Built for efficient installation

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 Type 316 stainless steel -The 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.