Inside micrometers are precision measuring tools used to determine the internal dimensions of objects, such as holes or tubes. They typically consist of a calibrated screw mechanism that allows for accurate measurements in small increments. The design often includes a set of interchangeable measuring heads to accommodate various sizes and shapes. These tools are essential in fields like engineering, manufacturing, and quality control, where precise measurements are crucial. Inside micrometers can measure internal diameters, depths, and other features, ensuring that components meet specified tolerances and fit together correctly in assemblies.