YOST 1 1/2" Woodgrip drill screws. This is the ideal screw for fastening Internal gutter bar hangers! They are 11/2" long screws with a 1/4" hex-head. The head is slightly longer which gives more grab when screwing at a slight angle. The screw is galvanized steel with a "Long -life" Plastic coating. It has a very pointy tip for pulling through light sheet metal, quickly and easily