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 (.0001") 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