Acorn International SW-MW2BS250 Self-Tapping Screw #9 Thread High-Low Twin Lead Type 17 Point

#9-15 metal to wood screws are sealing self-piercing tapping screws made from heat treated C1022 steel case hardened for roofing and siding applications. A 1/4" across flats high hat hex washer head with assembled EPDM washer offers easy driving and conforms to the metal surface for a secure and long-lasting seal...