Acorn SW-MW1LG250 Metal Building Screw, 1" Linesman 3 flats on shank for

3 flats on shank for secure grip

right facing stop

Resist alcohol and household chemicals

Standard brass self-grounding clip

Lightweight (36 lbs

Acorn SW-MW1LG250 Metal Building Screw, 1" Linesman 3 flats on shank for#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. The twin lead type 17 point and hi lo threads offer faster drive time and greater resistance to pullout. All screws are 1,000 hour salt