Starrett 579E-12 telescoping gage measures internal dimensions from 2-1/8 to 3-1/2 inches (54 to 89 mm). The 12-inch (300 mm) handle length provides extended reach for deep bores and slots. This precision gage features a spring-loaded plunger and a locking screw to hold the measurement for transfer to a micrometer.

Features

• Precision ground radius on each gage provides two-point contact for maximum accuracy
• Greater range
• Constant spring tension gives uniform contact pressure
• Both plungers are easily locked at any desired setting
• Handles are rigidly attached to the contact plungers and are automatically self-centering
• Ends of both contacts are hardened and ground to a radius to allow proper clearance on the smallest hole the gage will enter