Senco DuraSpin® Collated Screws for Drywall to Wood applications. Phillips No.2 drive, black phosphate finish, coarse thread, bugle head. 50 screws per strip. CE-marked (EN145566). Suitable for both cordless and mains operated machines.Senco DuraSpin® Collated Screws for Drywall to Wood. Size: 3.9 x 25mm.