Countersunk head self drilling screw Dia: 3.5-6.3mm; 6#-14# Length: ... .5-125mm; 3/8"-5" Material:C1022 Finish: zinc plated SELF DRILLING SCREWRaw materialC1022,Diameter3.5mm, 3.9mm, 4.2mm, 4 ... zincPacking1000pc/box,500pc/box,10kg/carton,20kg/carton,25kg/carton self drilling screw/csk head screw/galvanized screw