Features 1、Made of high quality carbon steel material, durable and long service life. 2、The ruler is of fine grinding processing and laser engraving which can provide accurate readings. 3、High accuracy, the measurement accuracy is 0.02mm 4、This ruler is of machining, suitable for measuring the inner diameter of the Inner hole 5、Widely used in the field of machining to measure the diameter of the bore. Specification Features: 1. Made of high quality carbon steel material, durable and long service life. 2. The ruler is of fine grinding processing and laser engraving which can provide accurate readings. 3. High accuracy, the measurement accuracy is 0.02mm 4. This ruler is of machining, suitable for measuring the inner diameter of the Inner hole 5. Widely used in the field of machining to measure the diameter of the bore. Specification: Condition: 100% Brand New Material: Carbon Steel Measurement Accuracy: 0.02mm Reading Value: 0.02mm Scope of Application: Machining, Measuring the Inner Diameter of the Inner Hole Graduation Value: 0.02mm Processing: Fine Grinding, laser Engraving Package List: 1 * Inside Groove Caliper Note: New-style and old-style are shipped randomly Package List