Senco DuraSpin® Self-Drill Collated Screws for drywall to light steel applications. Phillips No.2 drive, phosphate zinc finish, fine-thread. 50 screws per strip. CE-marked (EN145566). Suitable for both cordless and mains operated machines. Senco DuraSpin® Collated Screws for Drywall to Light Steel. Size: 3.9 x 35mm. SEN39B35MP