High-quality material, can be used for various internal size measurement, fine workmanship, no burrs.Clear marking line, easy to read.The main body of the micrometer is made of stainless steel, and the surface is chrome-plated, wear-resistant and durable.Locking device design and precise machine structure make reading more intuitive and convenient.Built-in ratchet stop device to ensure accurate repeated readings.Type: Inside MicrometerMeasuring range: 5 to 30mmAccuracy: 0.01mmColour: silverMaterial: stainless steelPackage Contents:1 * Micrometer1 * Wrench1 * Calibration ring1 * Wooden boxOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.