Standard Sunnen dial bore gauges read out in tenths. Feature all-carbide gauging points, wearproof ball crank and adjustable centralizers. This model measures to .270" of the bottom of a blind bore. Carbide balls replaceable in the indicating fingers only. Use the Sunnen SCF-502 setting fixture. Retractable. Diameter Range: .740" to 1.1900". Max Gauging Depth: 12.00". Overall length: 17.6875"