Fowler's Interchangeable Anvil Micrometers are very popular in machine and auto repair and for all other applications requiring a versatile micrometer. Each micrometer is equipped with a series of easily interchangeable anvils to fulfill the ranges listed. Standards are also included to accurately adjust the required range. Hammertone blue baked enamel frame. Graduations (.001") are microfine on satin chrome for easy reading Each anvil is fitted with an adjusting collar to set the overall dimension Spindle thread is hardened and precision ground with microlap finish in carbide tipped measuring faces Ratchet stop ensures exact readings A wrench is included for fast, easy zero adjustment on the sleeve Positive lever locking clamp assures accurate settings Standards are included with each set Includes case