The Fowler-Bowers XT Internal 3-Point Bore Gauge with Inserts is a precision tool for measuring internal bores, using a three-point contact system to improve stability and roundness readings. It covers bore sizes from 1-3/8 in to 2 in and includes inserts that allow you to adapt the gauge to different hole sizes. The inserts provide a measurement increment of 0.00025 in, enabling fine verification of internal dimensions in machined parts where precise bore size matters.
