Hollow Bolt,Stainless 1.ISO,ANSI,CE,JIS,DIN,BS& non-standard fastener supply 2.ROHS is capable 3 ... .Grade:4.8 ,6.8,8.8,9.8..... Hollow Bolt,Stainless Steel Hollow ... qualified when they reach in customer's hands .2.Recently,several New quality control equipments had brought ... places such as drywall,concrete,chipboard,machine,wood...2)Main export market:North America,South America,Eastern ...