... 4.ISO stainless steel cap screwsMaterial:stainless steel,copper,alloy steel,aluminumStandard:ISO,DIN,BS,JIN,ASTM ANSI BA UNC UNFThread:metric and inch sizeHead ... ,DIN,JIS,BSW,ANSI,ISO & non-standard productsSurfacePlain, Yellow zinc, black phosphated, grey phosphated, nickel platingQualityBe affordable but of very high ...