2" - 12" Inside Micrometer includes .001" Microfine graduations on satin chrome.Each set consists of an inside micrometer head and a series of fully hardened and lapped extension rods of different lengths. Spindle thread hardened, ground and lapped. Anvil and spindle are hardened and precision ground with microlap finish on ends. Reference standard included with set. Includes a wrench and fitted case. We ship APO, FPO, and combine shipping.