Pro-Twist Construction Fasteners are engineered for professional-grade use in commercial, industrial and residential applications. Whether the job involves drywall, steel framing, mobile home construction, electrical or plumbing work, plastering or metal roofing, Pro-Twist has the optimal fastener for every situation. Grip-Rite Pro-Twist No. 8 Sizes X 1/2 in. L Hex Hex Washer Head Sheet Metal Screws are great for a variety of projects. With a hex head for easy gripping and a washer head for a tight seal, these screws are perfect for attaching sheet metal to wood or other materials. The Pro-Twist design provides superior holding power and a clean, professional look.