Starrett Inside Micrometer 3-4mm Range 68142

Product Highlights Wide measurement range without changing anvils Resolution from .0001" (0.0025mm) on the 2-point contact tools ranging up to 1/4" (6mm) and .00025" (0.005mm) on the 3-point contact tools ranging from 1/4"-12" (6mm - 300mm) Tungsten carbide measuring faces on all 3-point heads above 1/2" (12.5mm) Ratchet stop ensures consistent measurements Self-centering contacts for true readings Blind bore measuring capability above 1/2" (12.5mm) diameter Extensions available up to 6" (150mm) for deep hole measuring Setting rings included Depth stop/collar also available for .080"- .250" (1-6mm) range Each micrometer bore gage is furnished in a case, complete with setting ring, contacts, wrenches, and instructions.