Black Hexagonal Bolt 1.Diameter: M6-M30 2.Length: 10MM -250 ... 3.Grade: 8.8,10.9,12.9 4.Surface: black,zinc-plated ect Various fastener producer in China.Mainly include ... ,12.94.Standard : GB,DIN,ANSI,BS ect 5.Surface: black, zinc-plate, Nickel-plate, etc We can do the surface ...