MINItrack clip screw is a 1-piece 1" Phillips #2 stainless steel screw with specially designed clip head . Screw attaches to wood framing of your porch and the MINItrack aluminum framing snaps over clip head of screw, securing system framing to your porch resulting in 100% hidden fasteners which will not rust. For use with MINItrack model No. MT6W (Sku 274631), MT8W (Sku 274615), MT6B (Sku 274690), and MT8B (Sku 274674). Comes 100 per bag.