Starrett 124MCZ Solid-Rod Vernier Inside Micrometers Set, 200-800 mm Range, 0.01 mm Graduation, +/-0.003" Accuracy, With Case

These are the most popular inside micrometers because of their lightness, ease of use and range. They are very useful for measuring inside diameters of cylinders and rings, measuring parallel surfaces, etc. The desired range is obtained by assembling rods and spacing collars to the micrometer head. Measuring rods are provided with a shoulder that is set accurately in the micrometer head and locked in position. When assembling rods to the A and B heads, the reading line on the micrometer head should be lined up with the marking on each rod (except for the 50-75mm rods). Rod diameters are approximately 8.5mm. Each rod has individual length adjustment for the anvil by means of special wrenches furnished. Movement of screw: 25mm, number of measuring rods: 4, Number of spacing collars: One 25mm Two 50mm.