Precision engineered jumbo sized dual head chuck service gauge provides accurate and long life trouble free performance. Plated steel tube with a 4 sided nylon indicator bar is perfect for large bore tire valves. Product Features:Durable hot stamped, not pad printed indicator barSolid brass tube with nickel plating100% calibratedHang up loopMaximum 160 pounds per square inch or 1100 kilopascal