Key benefits - Self-centering double action handles ensure precise engagement with holes, slots and recesses, reducing misalignment during checks. - Enables quick, repeatable verification of holes, slots and recesses up to 6 inches deep, speeding inspection and setup. - Durable construction: the ends of both plungers are heat treated steel and ground to a radius for proper clearance on the smallest hole the gauge will enter. - Constant spring tension delivers uniform pressure for consistent readings and reliable results. Core features - Double action handles rigidly attached to the plungers for robust, dependable operation. - Automatic self-centering design minimizes operator adjustment and improves accuracy. - Depth capability: checks and fits holes, slots and recesses up to 6 inches deep. - End construction: heat treated steel ends with a radiused ground finish to ensure smooth entry and clearance in tight openings. - Spring system maintains constant tension to produce uniform pressure across use. Specifications and attributes - Depth range: up to 6 inches - Material: heat treated steel ends - End geometry: radiused and ground for proper clearance - Operation: double action handles with automatic self-centering Use scenarios - Machining and fabrication shop: quickly verify that drilled holes and slots are accessible and within intended depth during drilling and finishing operations. - Assembly line quality checks: confirm proper engagement and clearance when parts with holes or recesses are assembled, reducing fit issues downstream. - Fixture setup and inspection: use during setup to locate pockets or recesses and ensure corresponding components will clear and seat properly without interference. This device provides a reliable, straightforward way to assess holes, slots and recesses with consistent pressure and precise self-centering action, up to a depth of 6 inches, using heat treated, radiused end plungers and a constant-tension spring.