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[8 TO 150MM RANGE] This 6 piece telescopic bore gauge set covers 8 to 150mm with overlapping sizes to reduce gaps between gauges making bore checks easier across small holes grooves and larger internal diameters. [ACCURATE TRANSFER MEASUREMENT] Hardened tool steel contact points are ground to a radius for reliable inner diameter pickup in small bores and slots then transfer smoothly to a micrometer or caliper for final reading. [SELF CENTERING PLUNGERS] Double action spring loaded plungers automatically align in the bore to reduce guesswork and improve repeatability helping machinists woodworkers and metalworkers work with more confidence. [SECURE KNURLED LOCK] Each T bore gauge features a knurled locking device that holds the measured size firmly when removed from the hole helping preserve accuracy during transfer measurement in busy workshop use. [DURABLE TOOL STEEL BUILD] Made from tool steel with a plated finish this set is built for repeated measuring tasks from shallow grooves to deep recesses and comes as a practical 6 piece workshop kit.