Coarse Thread. Designed for fixing plasterboard to metal studding or wooden battens. Bugle head with Phillips recess allows the screw to be driven without damaging the board surface. Black phosphate finish. Driver bit included. These specialist drywall screws are ideal for fitting plasterboard, fibreboard, and other insulation board types to wood or steel studding. An extra-deep insert bit recess ensures a firmer positive drive. Featuring an incredibly sharp piercing point and coarse thread, they provide speedy insertion and improved holding power. The countersunk Phillips drive bugle head minimizes surface damage for a smoother finish, allowing the screw to sink effortlessly into dry lining without needing countersinking. A black phosphate coating enhances resistance to corrosion and rust. Made from fully hardened C1022 steel, the thread is specifically designed for fast insertion and strong holding power. A Phillips bit is included with each box.