stainless steel self drilling screw 1.screw size,ST2.9-ST6.3, 2.length, ... .5-150mm 3.certificate,Onsite Check,ISO, 4.din7504k stainless steel self drilling screw1.screw size,ST2.9-ST6.3,2.length,9 ... ,Onsite Check,ISO,4.din7504kProductyellow zinc plated hex flange screwMaterialStailess steel SS316,SS304,SS410,carbon steelFinishPassivation,Chromium-Plating,Black Oxide, Zinc ...