ACCURATE MEASUREMENTS: This bore gage features a dial indicator with a graduations of 0.0005" and a measuring depth of 9.5" EXTENDED RANGE: This 1.4-6" range bore gage, with a two-point contact system, is used for measuring hole diameters and also to detect geometry abnormalities such as ovality and taper; carbide-tipped anvil contact points provide extended wear and improved abrasion resistance SELF CENTERING: The easily adjustable bore gauge is self-centering for fast, accurate measurements EASY AND EFFICIENT: This bore gage comes with an insulated grip and a chrome plated handle for easy use. SET INCLUDES: Set comes with two self-centering measuring heads, an extension holder, spacers, and a fitted case