Hollow Bolt,Stainless 1.ISO,ANSI,CE,JIS,DIN,BS& non ... :4.8 ,6.8,8.8,9.8..... Hollow Bolt,Stainless Steel Hollow Bolt,Bolt with Internal Thread.1.What’s the ... FinishZinc plated,Nickel plated,Dacroment Plated,chromium plated,Tin plated,Black phosphating ,anodized ,Parkerising,and Environmental Plated is used in our ... to call me any time !Tel:+86-15917002605 Stainless Steel Hollow Bolt With Internal Thread