Aircraft Tool Supply - FOWLER® DIAL BORE GAUGE SET (2-6") PN: 52-646-300 https://aircraft-tool.com/shop/detail.aspx?id=52-646-300 Range 1.4 - 6" .0005" Grad Carbide Anvils Includes extension Chrome Plated Handle Easy-to-read Includes Case 2"-6" Range. An