The Brown & Sharpe 599-792-21 Audible Edge Finder is made from Hardness Rockwell C (HRC) 58-rated steel for increased durability, and is ground for smoothness and case-hardened on the ends for usability. It features a 1/2” shank and 0.200” head diameter and is available in multiple sizes. Heads are manufactured to within .0001” of stated size. Audible and visual measurement capabilities help increase accuracy.Audible edge finders release an audible click when the tip jumps, allowing users to hear as well as see the tool, for increased accuracy. The rotating instrument has a machine spindle that must be turning for the tool to work.Brown & Sharpe was founded in 1833, had a major part in setting industrial standards in the United States, and has given its name to several standards, including a tool spindle taper, a worm threadform, and others. Brown & Sharpe was acquired by Hexagon Metrology in 2001, and has since focused on precision measuring equipment and metrology hand tools. The Brown & Sharpe line of coordinate measuring machines (CMMs), optical measuring systems, benchtop measuring machines, and precision hand tools offer consistent, high-quality design, construction, and performance. Brown & Sharpe has manufacturing facilities in North America, Switzerland, and China. Audible and visual measurement for increased accuracy Ground for smoothness and case-hardened on the ends for usability Available in multiple sizes for versatility Made from Hardness Rockwell C (HRC) 58-rated steel to help reduce wear and corrosion Heads are manufactured to within .0001” of stated size ASIN B0006J3DOU Item Weight 1.87 ounces Manufacturer Hexagon Metrology Item model number 745-255 Package Dimensions 6.46 x 2.87 x 0.59 inches