Features [MAIN PURPOSE] The aperture gauge is mainly used to measure the inner hole of thin walled parts, the inner diameter of plastic pipes, etc. [MEASURING RANGE] The measuring range is 1‑6.5mm, with 0.1mm division value, has high efficiency and accuracy. [STAINLESS STEEL] Made of excellent stainless steel material, hard and wear resistant, not easy to rust or corrode. [LASER SCALE] There is laser engraved numeral scale on the cone surface, which can clearly observe the readings. [SIMPLE STRUCTURE] The taper aperture gauge structure is simple and reasonable, and the measurement is convenient and quick. Specification: Item Type: Aperture Gauge Material: Stainless Steel Measuring Range: Approx. 1-6.5mm / 0.04-0.26in Accuracy: 0.1mm Package List: 1 x Aperture Gauge Package List 1 x Aperture Gauge