blind bolt BL-F510 1.material:zinc alloy 2.finish:light,sand-polished 3.size:4 ,6 ,8 inches zinc alloy blind bolt BL-F510 1.material:zinc alloy2.finish:light,sand-polished3.size:4,6,8 inchesour show room: our fair exhibition our active: Zinc Alloy Blind Bolt (F510)