Sunnen Dial Bore Gauge with Wooden Case and Extensions, Measurement Range: 2-6 inches (5.08-15.24 cm), Dial Indicator Range: 0.001 inches, Graduation: 0.0001 inches, Total Length: 10 inches (25.4 cm), Weight: 2 lbs (0.91 kg), Material: Metal and Plastic, Serial Number: 01057.