... or yellow zinc or blue zinc or black 1)Name:hexagon bolt or JCBB& JCBC Bolt2)Surface finish: white zinc or yellow ... :M6*(12,16,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,100,110,120 ... ,130)M8*(16,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,100,110,120 ... )Our items are best quality and reasonable price. chamfering inner hexagon bolt