SS410 self drilling screw 1.screw size,ST2.9-ST6.3, 2.length,9.5-150mm ... .certificate,Onsite Check,ISO, 4.din7504k SS410 self drilling screw 1.screw size,ST2.9-ST6.3,2.length,9.5-1503 ... .certificate,Onsite Check,ISO,4.din7504kProductyellow zinc plated hex flange screwMaterialStailess ...