Senco SEN39B45MP DuraSpin Collated Screws Drywall to Light Steel 3.9 x 45mm (Pack 1000) 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. Used for fastening interior Drywall to light gauge metal studs CE-marked (EN145566). Suitable for both cordless and mains operated machines. Senco DuraSpin Collated Screws for Drywall to Light Steel. Size: 3.9 x 45mm.