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 25mm.PTDSEN39B25MP