TELESCOPING GAUGE 579C STARRETT 52612

The Starrett 579 Telescoping Gage is used to determine the exact size of holes, slots, and recesses up to 150mm (6"). The ends of both contacts are hardened and ground to a radius to allow proper clearance in the smallest hole the gage will enter. The tool must be slightly rocked in the hole to be measured to ensure it is sitting on the correct diameter before locking and removing it. The final hole size is obtained by measuring the gage's contacts with a micrometer. Range: 19-32mm (3/4-1-1/4"). Handle length: 60mm (2-3/8").