The Starrett 25 Series Dial Indicator has a shockless, hardened steel gear train and jewel bearings, except where noted. It is furnished with a lug-on-center back. Antimagnetic mechanism is optional. Special non-shock mechanism is available. 0-1.000" Range, 0-50-0 Balanced Dial, .001" Grads, .100" Range Per Rev, .375" Stem