#6, 1 5/8″ Phillips Bugle Head, Fine Thread, Phosphate Coating from Canada Fastening is a type of drywall screw used for attaching gypsum board to wood studs or to light-gauge steel framing. The screws feature a #2 Phillips drive and a sharp point for easy installation. The fine thread design provides a secure hold, and the phosphate coating provides corrosion resistance. The bugle head design helps to reduce surface damage on the drywall during installation.