❤ Made of carbon steel, nickel plating, good finish and toughness, not easy to break.,❤ Lasers etched with millimeters and increments for easy, accurate reading.,❤ Easy to use, simply place the gauge on clearance or , and read the measured value.,❤ Widely use for measuring thin wall parts, plastic pipe, inner diameter, inner hole, and clearance, for diameters of small holes, slots etc.,❤