Outer ring gauge, known as the outer diameter of the ring gauge, cylindrical column proofreading. Similar smooth plug. The main material is bearing steel Gcr15, artificially hardened outer ring gauge hardness precision meet national standards. Outer ring gauge measuring cylinder diameter main inspection tool. Compared the two, outer measuring surface with the same specifications plug thicker, accuracy and aura, like the zero line do fluctuate. I plant: threaded plug, threaded ring, smooth Cypriot ring, smooth ring gauge, calipers, sine, Mohs gauge, various test rods, cylindrical Square, square boxes, flat, V-shaped frame, granite slab, flat feet parallel to the regulation, rectangular device, square boxes and other non scalar gage. Mitsubishi imports of wire walking external processing Tel:. 18632765185 QQ: 1101491384 Website: http://www.hhjmlj.com/