Internal Diameter Gauge — 8–150 mm Key benefits Accurate measurements across a wide range: measures internal diameters from 8 to 150 mm so you can use one tool for small bores up to larger holes. Faster, more reliable inspection: the adjustable, snug-fitting tips reduce measurement error and help you get repeatable results, cutting rework and guesswork. Easy to use and store: the retractable design lets you extend only what you need for measurement and collapse the gauge for compact storage and safe transport. Comfortable handling: the round head provides a secure, ergonomic grip for steady positioning and easier alignment inside holes. Main features Measurement range: 8–150 mm — covers most common internal diameter tasks without switching tools. Retractable design: extend or retract the gauge to match the hole depth and access confined or deep bores. Adjustable, precise fit: set the arms to sit snugly against the bore for accurate readout and consistent results. Round head: ergonomic shape for comfortable handling and better control during measurement. How it solves problems Eliminates guesswork when checking bores and holes by providing a consistent, adjustable contact with the inside surface. Reduces time spent swapping tools or making trial measurements thanks to the broad measurement range and simple extension mechanism. Minimizes measurement variation caused by awkward hand positioning through the ergonomic round head. Practical applications Mechanical workshop: quickly check bearing housings, bushings, and cylinder bores during assembly or maintenance. Quality control and inspection: verify hole sizes in machined parts before shipping to ensure parts meet tolerances. Plumbing and fabrication: measure internal diameters of pipes, fittings, and fabricated components for proper fit-up. What to expect in use Simple setup: slide the gauge to the approximate size, insert into the hole, then refine the adjustment until the arms seat firmly against the inside surface. Reliable results for routine inspection, maintenance, and assembly tasks where internal diameter accuracy matters. Note: Designed for measuring internal diameters from 8 mm to 150 mm with a retractable, adjustable mechanism and a round head for comfortable handling.