... # Length: 9.5-125mm; 3/8"-5" Material:C1022 Finish: zinc plated SELF DRILLING SCREWRaw materialC1022,Diameter3.5mm, 3.9mm, 4.2mm ... ")Shankself drillingSurfaceZinc plated , yellow zinc or white zinc ,or blue zincPacking1000pc/box,500pc/box,10kg/carton,20kg/carton,25kg/carton white zinc plated self drilling ...