The Fowler Bowers 52-255-030 Bore Gauge Setting Ring is a setting ring used to calibrate a bore gauge for internal-diameter measurements in the 4.000" to 5.000" range. It comes with a protective case for storage and transport. The part number 52-255-030 identifies this setting ring in the Fowler Bowers catalog, offering a known reference size for bore measurements in machining and metrology workflows. Use this ring to establish a reliable reference when checking bores within its target range, ensuring consistent readings across multiple checks.
