high strength bolts 1.Size:M16-M30.length:40mm-200mm 2.Grade : 8.8 s, 10.9s 3.Surface: black, yellow zinc, HDG,ect. Sets of high strength hex head bolt for steel structures.Brand name : RL or OEM service1) Description: high strength bolts2) Standard: DIN,ANSI/ASME,BS,AS,GB3) Nominal size: M16-M30( 2/3"--6/5") Screw length 50mm - 150mm(2" - 6")4) Surface: black, yellow zinc, white blue zinc, H.D.G ...