Material:C1022Main Feature:with diamond point, bugle head, phillips drive, twin fast , coarse/fine ThreadSize:all different sizes such as 3.5x19mm,3.5x25mm,3.5x30mm,3.5x32mm,3.5x38...Finished:Black/grey phosphated, white zinc coated, color zinc coated, blue zinc coated...Usage:Have a high tensile strength value and durable enough to handle repeated assembly and disassembly. So often used to fasten sheet metal, composite materials, woods, plastics and fix the gypsum board with steel frame.Package:500pcs-1000pcs/box,16-20boxes/carton as common,also can pack as required