brass butterfly bolt stainless steel butterfly bolt titanium bolt SpecificationsButterfly Bolt good pricehigh quality Standard:DIN, ISO, ANSI,JIS and special type according to drawings Grade:Class 4.8 / 5.8 / 6.8 / 8.8 / 10.9 / 12.9 & Grade 2, 5 ,8, 10 Diameter:M4--M24 Length:Base on customers' requirement Material:Carbon steel, Stainless steel ,Copper, Alloy Steel Surface:Plain, zinc plated,HDG, ...