Simpson Strong-Tie #14 x 3-1/4" Self-Drilling Screw with Wings, Flat Head - 410 Stainless Steel, Qty. 100 Flat Head 410 Stainless Steel Masonry Screws Use a power driver with

Use a power driver with a #2 square-drive bit

and sealant

Double-Barrier Coating – Resists corrosion in wet

Designed specifically for attaching wood sheathing

More Strength

Simpson Strong-Tie #14 x 3-1/4" Self-Drilling Screw with Wings, Flat Head - 410 Stainless Steel, Qty. 100 Flat Head 410 Stainless Steel Masonry Screws Use a power driver withWhen you need to fasten wood, plywood or fiber cement board directly to steel framing without pre drilling, this Simpson Strong Tie F14C325FDC Self Drilling Flat Head Screw With Wings delivers the performance you expect. Wings create a clearance hole in the top material so the shank will not ride up, then break off as the drill point engages steel. The flat countersunk head offers a clean, flush finish and the full length machine screw threads provide