Material: Steel Diameter: 3.5/3.9/4.2/4.8 Surface: black or grey phosphated or zinc plated screw Specific: bugle head, phillips drive, coarse/fine ThreadFinished:phosphated(black,grey), galvanized(bule,white,color),black oxide Package:bulk or small box or as customer's requestscrewIf you have any interest about this product, please contact with us fasteners dry wall screw