... .grade:8.8 2.finishing:zinc 3.material:alloy steel Non-standard perforation no thread screw((Including machining) 1.Standards:DIN ,ANSI ... /ASME,BS,GB,JIS,Non-standard2.Metail:Carbon steel,stainless steel,alloy ... steel...3.class:4.8,8.8,10.9,12.9.etc4 ...