... :3.5mm-6.3mm 4.Finish:zinc plated Hexagon washer head self drilling screw with tapping screws thread Standard:DIN 7504, ANSI ... .64, Hex washers self drilling screw,Washer Head Self-Drilling Screw ,Pan Framing,drywall screw of self drilling screw), Hex Head self drilling screwSpecial ... steel, 304, 316 (A2, A4), SS 18-8.Available Size:Screw: Dia.6#-14#, Length: 13mm-100mm (1/2"-4")Finishing ...