The Starrett Split Collet is for mounting AGD indicators with 8 mm stems in gaging and work location fixtures, these collets simplify fixture mounting. Screw the collet into the fixture or into our 648 Depth Gage Base, insert the indicator into the collet and tighten it in place with the hexagonal nut. Internal collet fingers grip the stem with equal pressure to eliminate spindle binding. Made of steel with black finish. Overall length of collet and threads is 1". Split Collet, Metric Thread, M12 x 1.75 Overall length of collet and threads is 1". 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. 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.