... 10 years manufacturer 3.SGS,Rohs certificatione 4.free sample socket head cap screwsMaterial:stainless steel,steelStandard:ISO,DIN,BS,JIN ... :philips,phil-slot,pozi,hexsocket,six-lobe,square,triangle,slotted,torx Place of OriginGuangdong China(mainland)Brand NameJinriMaterialCarbon steel & stainless steelSizeAll ... let us know without any hesitationContactAmy fax:86-769-86734870 socket head cap screws