The Groz Bore Gauge (Taper Gauge) is a versatile and accurate measuring tool that is ideal for die makers, machinists, and those who work on inspection floors. Manufactured from high-quality stainless steel the gauge features permanently engraved imperial graduations on one side and metric on the other. The gauge is accurately tapered throughout the entire length making it ideal for measuring the diameters of small holes, slots, and other similar shapes. Whether you are checking the dimensions of a small hole or working on bearings the Groz Bore Gauge is the ideal solution.