6Pcs/Set Telescopic Gauge Set 8 150mm Adjustable Inner Diameter Nickel T Bore Hole Plated Square Head Micrometer Measuring Tools

[GROUND CONTACT POINTS] Hardened tool steel contact points are ground to a radius, ensuring accurate measurements even in the smallest holes. Ideal for machining and engine work where tight tolerances are . [WIDE MEASUREMENT RANGE 8-150MM] This 6-piece set covers a broad range of bore sizes with overlapping gauges to eliminate measurement gaps. Perfect for machinists, woodworkers, and metalworkers needing versatile hole measurement solutions. [SELF-CENTERING DESIGN] Spring-loaded plungers automatically center themselves in the bore, removing guesswork and ensuring true diameter measurements every time. Saves time and improves accuracy in busy workshops. [RELIABLE LOCKING MECHANISM] Knurled locking screw firmly secures measurements when withdrawn from the bore. This slip-resistant design maintains accuracy when transferring measurements to micrometers or calipers. [CONSTANT SPRING TENSION] Uniform contact pressure is maintained through consistent spring tension, providing repeatable accuracy across all measurements from shallow slots to deep 6-inch recesses.