Pack of 1,000 Senco DuraSpin® Collated Screws Drywall to Heavy Steel 3.5 x 45mm Senco DuraSpin® Collated Screws for Drywall to Heavy Steel applications. Phillips No.2 drive, clear zinc finish, fine thread. 50 screws per strip. CE-marked (EN 14592). Suitable for both cordless and mains-operated machines.