Buy an inside micrometer with a 0.39" to 0.47" range for measuring the inner dimension of the hole diameter, groove, etc. High precision internal micrometer with a 150 mm extension rod can measure the size of deep holes easily and conveniently. Stable bearing steel materials and clear scale for an accurate reading.
The inside micrometer is an instrument for the accurate linear measurement of the diameter, thickness, length and other dimensions of solids. 3 point internal micrometer is mainly used to measure internal dimensions such as the internal diameter of a hole or a tube and is widely used in mechanical engineering, machining and most mechanical industries.
Tips: Types of Micrometers