These forgefix phillips single coarse thread sct drywall screws have a black phosphate finish for increased durability their bugle head allows the screw to sink effortlessly into the dry lining without the need for countersinking which in turn minimises the damage to the surface they are supplied collated with 50 screws per strip and 1000 screws per box applicationdesigned for fitting dry lining to studding phosphate coatings are made up of thin crystalline layers of phosphate compounds that adh