Key benefits at a glance Durable chromeplated construction for long life in demanding environments. The bright finish adds corrosion resistance and makes the tool visually easy to inspect during use. Broad measuring range of 5/16 inch to 6 inch (8 mm to 150 mm) covers many industrial and automotive tasks. Easy to use: extend into the hole or recess, lock, and take a precise reading with a micrometer or caliper. Six gauges included, organized in a sturdy storage box. The case protects the tools, simplifies transport, and keeps them ready for professional use on the move. Consistent performance with constant spring tension. The gauges maintain uniform contact pressure during measurement, delivering repeatable and accurate readings for quality control and engineering tasks. Product features and specifications Function and purpose: Telescoping gauges designed to measure internal dimensions such as bore diameters, holes, and recess widths. Use with a micrometer or caliper for precise measurements. Compatibility and usage: Suitable for industrial and automotive settings where internal measurements are required. Extend the gauge into the target area, lock it, and read the internal dimension with a micrometer or caliper. Size range: 5/16 inch to 6 inch (8 mm to 150 mm). This range is suitable for a wide variety of internal measurement tasks. Material and finish: Chromeplated construction for durability and corrosion resistance, with a bright, reflective surface that helps in inspection and longevity. Performance: Constant spring tension ensures uniform contact pressure, improving measurement consistency and reliability. Practical applications Automotive: Measure bore diameters in engine blocks or cylinder housings to verify wear or replacement needs. Industrial machinery: Check internal widths of housings, sleeves, or slots to ensure proper fit and tolerances during assembly or maintenance. Quality control: Use in inspection routines to verify internal dimensions against specifications, supporting consistent manufacturing results. Usage guidance Extend the gauge into the hole or recess. Lock the gauge at the desired span. Remove the gauge and measure the external span with a micrometer or caliper to obtain the internal dimension. What sets this set apart The combination of a wide 8 mm to 150 mm range, six gauges, and a robust storage box provides a readytouse solution for internal measurements across multiple applications. The constant spring tension design delivers uniform contact pressure, contributing to repeatable, accurate readings that are essential for engineering and QC workflows. Chromeplated construction offers durability and resistance to wear, supporting reliable performance in professional environments over time.