Mechanical Interchangeable-Anvil Outside Micrometer Range 12 in to 18 in Resolution 0.001 in Accuracy +/-0.0003 in SPC Output No Anvil Shape Flat Dimension Type Inch Operation Type Mechanical Thimble Type Plain Anvil Material Steel Case Included Yes Case Type Wooden Features Interchangeable Anvils Includes Wood Case Lock Nut Type Ring Maximum Measurement - Inch 18 in Minimum Measurement - Inch 12 in Spindle Material Steel