INSIZE Tube Micrometer with Pin Anvil Designed to measure the wall thickness of various tubing. Features Include... 0-1.0" Measuring Range 0.0001" Graduations 0.00024" Accuracy 0.071" Pin Diameter 0.256" Spindle Diameter Carbide Tipped measuring face Ratchet stop Painted frame with heat shield Lever lock Fix anvil length: 0.315" / 8 mm Furnished in fitted case