The Industrial FB-3-4-W-INS-STD Internal Bore Gauge from Fowler-Bowers is a 3-point internal bore gauge designed to measure bores from 3 to 4 inches in diameter. It uses three contact points to yield stable, repeatable readings, and the W-INS-STD model code indicates inserts are included in the standard configuration. This gauge is well suited for inspecting internal diameters in tooling, machined parts, or assemblies where precise bore size is required.
