Mitutoyo Inside Micrometer Set Interchangeable Rod Type 50 300mm Oil Cans Constructed with a strong puncture Constructed with a strong puncture and abrasion resistant 14112 1 2"Dr Impact Torsion Bar 1 2"Dr 100Nm x 196mm 01mm graduations Inside Micrometer set Interchangeable Rod Style 5 extension rods included Each interchangeable extension rod is marked with its measuring range For models supplied with more than one rod Mitutoyo Inside Micrometer Set 50 300mm Interchangeable Rod TypeWide range of inside measurements possible by combining extension rods and anvils with the measuring heads The sleeve is rotated to adjust the index line position when setting to a length standard