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 Beam-to-Beam Connections: Supports complex framing

Beam-to-Beam Connections: Supports complex framing layouts with angled beam connections

Flexible design: Roofjack size accommodates pipes from 1/4" - 5-3/4"

and sealant

Designed specifically for attaching wood sheathing

Reliable Thread Engagement: Threaded design cuts into concrete for strong

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 Beam-to-Beam Connections: Supports complex framingWhen 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