The Starrett 830 Small Hole Gage Set includes all gages that are only 2" (50mm) long, making them convenient to use in close quarters. SET of 5: One each of Nos. 830A/B/C/D/E, in Case quarters. Ideal for accurately measuring small holes, slots, grooves, and recesses and used for general work. Precision Ground Radius on each gage provides two-point contact for maximum accuracy. Smooth, sensitive adjustment and adjustment of the gage beyond their range is restricted by a safety stop that prevents breakage. It is convenient to use in close quarters that provide more accurate measurements. The L.S. Starrett Company, founded in 1880, manufactures more than 5,000 variations of Precision Tools, Gages, Measuring Instruments and Saw Blades for industrial, professional and consumer markets worldwide. Starrett tools are essential for the many products that are measured, cut, formed or assembled. They are used in a broad range of manufacturing facilities as an essential part of metalworking, the manufacturing of durable goods, for working with exotic materials and in a wide variety of traditional and newer industries such as electronics, aerospace, energy and many others.