[Durable and Reliable]: Our pin gauges are made of bearing steel, durability and long-lasting reliability. [Enhanced Features]: The gauge surface is polished and burr-free, with a finish of 10 microns or better. [Clear Markings]: Each gage size is clearly marked in the case, and size information is etched on each pin gage making it easy to identify and use. [Versatile Use]: Great for checking diameters of holes, bushings, and worn parts, as well as the distance between holes and hole location. It can also calibrate vernier calipers, micrometers, and other measuring equipment to detect geometric deviations. Tight Tolerances: Designed with a ±0.0002" tolerance, ideal for precision engineering applications.