SPI Dial Bore Gage Set Specifications include the following... 0.7" - 6" Measuring Range 0.0005" Graduations Dial Indicator Set includes the following... 3 Interchangeable Measuring Heads 0.7" - 1.4" 1.4" - 2" 2" - 6" Carbide Contact Point Anvils 0.7", 0.8", 0.9", 1.0", 1.1", 1.2", 1.3" 1.4", 1.6", 1.8", 2.0", 2.2", 2.4", 2.6", 2.8" 3.0", 3.2", 3.4", 3.6", 3.8", 4.0" 2" Extender 3 Spacers / Washers 0.02", 0.05", 0.1" Includes Fitted Case