The most popular inside micrometers because of their lightness, ease of use and range.  Ideal for measuring inside diameters of cylinders and rings, measuring parallel surfaces, etc.  Rod diameters are approximately 6mm (1/4").  Each rod has individual length adjustment for the anvil by means of special wrenches included.

• Hardened and ground anvils on rods, adjustable for length. 
• Head anvil is hardened and ground. 
• Each rod marked with length. Rods are insulated.
• Measuring rods are solid and assembled on one side of the micrometer head. 
• Quick-reading figures - every thousandth numbered on inch reading tools.