Mechanical depth micrometers are used to measure the depth of holes, slots, shoulders, and other projections. - They’re operated with a high-precision ratchet thimble. - Measurements are read on a vernier scale. - Interchangeable measuring rods with different depth ranges can be used with these micrometers. - Combination Ratchet and Speeder for Uniform Pressure and Quicker Adjustment - Satin Chrome Reading Surface is Glare Free and Resists Rust Range / 0 in to 6 in Resolution / 0.001 in Accuracy / +/-0.0001 in Base Length / 4 in Base Style / Full Dimension Type / Inch Number of Measuring Rods / 6 Operation Type / Mechanical Rod Diameter / 5/32 in Anvil Material / Steel Anvil Shape / Round Case Included / Yes Case Type / Padded Case Includes / Spanner Wrench Lock Nut Type / Ring Maximum Measurement - Inch / 6 in Minimum Measurement - Inch / 0 in Movement of Screw / 1 in Number of Gauges / 6 Rotating Spindle (Yes/No) / No Spindle Material / Steel Spindle Shape / Flat Thimble Type / Ratchet