The telescoping gauge set takes quick and accurate indoor measurements from 5/16 in. to 6 in.. The long rods make it easy to reach inside bores. The telescoping gauge set features spring loaded, self centering plungers and twist knobs for measurement locking. With a vinyl carrying case included for easy transport and storage Range x Depth: 5/16” to ½” x 4” 1/2” to ¾” x 4” ¾” to 1-1/4” x 4” 1-1/4” to 2-1/8” x 5” 2-1/8” to 3-1/2” x 5” 3-1/2” to 6” x 5” Features: Spring loaded, self centering plungers Twist-knob for measurement locking Includes vinyl case Show More