Comprehensive Set Includes six telescoping gauges neatly organized in a robust storage box. The box protects the tools and simplifies transportation and storage, making it a practical choice for professionals on the move. Quality Construction Chromeplated finish on each gauge for enhanced durability and corrosion resistance. The bright, reflective finish adds to the tool's endurance in demanding environments. Measuring Range Mastery Wide range of 5/16 inch to 6 inch (8 mm to 150 mm), suitable for a variety of industrial and automotive applications. Easy operation: extend into the hole or recess, lock, and measure with a micrometer or caliper for precise readings. Consistent Performance Designed with constant spring tension to maintain uniform contact pressure during measurement. This ensures reliable, repeatable readings, supporting quality control and engineering work. Use scenarios Automotive and engine work: measure bore diameters or pocket dimensions in engine blocks, cylinder heads, and related components. Machining and fabrication: check holes, recesses, and pockets on machined parts to verify tolerances during setup and inspection. Maintenance and industrial equipment: inspect valve seats, flanges, and other bore features during routine servicing or overhauls. Specifications and features at a glance Tool count: six telescoping gauges Material: chromeplated gauges for durability Measuring range: 5/16 in to 6 in (8 mm to 150 mm) Operation: extend, lock, and measure with a micrometer or caliper Construction emphasis: constant spring tension for consistent contact pressure Packaging: robust storage box for protection and portability