Description
Simpson Strong-Tie F12C250FDB Self-Drilling Flat-Head Screw with Wings — #12 x 2-1/2 in. #3 Square Type 410 (1800-Qty)
Use this screw for securing wood, plywood and fiber cement to steel (up to 0.209" thick). Wings bore through wood to create a clearance hole so piece does not climb up shank and then break off as they engage with steel.