expansion screw 1.screw size,M6-M20 2.length,9.5-150mm 3.certificate,Onsite Check,ISO, 4.nonstandard and customizing expansion screw1.screw size,M6-M202.length,9.5-150mm3.certificate,Onsite Check,ISO,4.nonstandard and customizing 5.products detailsProductexpansion screwMaterialStailess steel SS304,SS410,carbon steelFinishPassivation,Chromium-Plating,Black Oxide, Zinc-Plating,HDGSizeM6- ...