Description: Applicable to the comparison method to measure the workpiece diameter One end of the measuring head is the movable probe, and the other end is the changeable probe which is changed according to the measured aperture. Super precision up to 0.01mm, Range 18mm to 35mm diameter Comes with a storage case, easy to organize and carry Made of premium stainless steel and plastic, fine finishing, high quality, long service life Specification: Length: Approx.33cm/12.99 inch Measuring Range: 18mm-35mm / 0.71"-1.38" Accuracy: 0.01mm Material: Stainless Steel, Plastic Color: Black Package Includes: 1 Set of Dial Bore Gauge