Collated Drywall Plasterboard Screws 3.9mm X 75mm Course Thread Box of 500 - Collated Drywall Plasterboard Screws 3.9mm X 55mm Course Thread Box of 1000 - A drywall plasterboard screw packed on a strip for use with a gun, suitable for fixing plasterboard to timber. Coated with a black phosphate rust resistant coating, suitable for indoor use. Uses a Philips head No. 2 (PH2) bit.