The TIMco Self Drill Drywall Screws are purposefully designed for fastening drywall to steel substrates. These 3.5 gauge, 38mm screws come in a box of 1000 and are bright zinc-plated to resist corrosion, ensuring longevity and durability. Their self-drilling design provides a smooth and effortless installation, helping you save time on all your construction or renovation projects. With superior holding strength, these screws make a fantastic choice for both professionals and DIY enthusiasts.