... 10 years manufacturer 3.SGS,Rohs certificatione 4.free sample socket head cap screwsMaterial:stainless steel,steelStandard:ISO,DIN,BS,JIN ... UNFThread:metric and inch sizeHead style:variousSurface Finish:nickel plated,white zinc,black zinc,color zinc,blue zincPacking:poly bag,paper ... let us know without any hesitationContactAmy fax:86-769-86734870 socket head cap screws