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 35mm. SENCO Duraspin Collated Screws Drywall To Wood Screw 3.9 X 35Mm Pack 1000 in Black