
Black Phosphate Gypsum Board Bugle Head Collated Drywall Screws. Corrosion-Resistant Finish: Black phosphate coating provides durability for internal and external use. Self-Piercing Design: Sharp point allows fast fixing of plasterboard to wood studs without pre-drilling. Bugle Head Technology: Sets screws to the right depth without tearing the paper surface of gypsum board. High Strength Material: Made from C1022/C1022A carbon steel with Grade 12.9 strength rating. Versatile Application: Ideal for connecting gypsum board with wood or light steel keels. Customizable Specifications: Diameter, length, and finish can be customized according to specific size requirements. Fast Manufacturing: Standard delivery time is 25 days for most orders. Established Manufacturer: Fasto has been a top producer since 1999 with professional sales and two factories.