Need to measure internal diameters accurately? This inside micrometer set gives you precision up to 0.01mm. Choose between two ranges: 25-50mm or 50-75mm. It's made from durable stainless steel with a chrome-plated finish to resist corrosion. The alloy measuring head is designed for stable contact, and the built-in ratchet ensures consistent pressure for repeatable readings. A locking device lets you secure the measurement before removing it. Comes with a wrench for adjustments and a calibration ring to verify accuracy. Whether you're a machinist, engineer, or hobbyist working on engines, pipes, or precise parts, this tool offers reliable dimensional checking. Just note: the style (new or old) may vary, but functionality remains solid.