Standard Sunnen dial bore gauges read out in tenths. Feature all-carbide gauging points, wearproof ball crank and adjustable centralizers. This model measures to .200" of the bottom of a blind bore. Carbide balls replaceable in the indicating fingers only. Use the Sunnen SCF-502 setting fixture. Non-retractable. Diameter Range: .495" to .750". Max Gauging Depth: 7.00". Overall length: 11.8125"