8″ 3 Jaw Self Centering Plain Back Lathe Chuck Reversible .0039″ TIR Cert R[
SHARS 8″ 3-Jaw Self-Centering Lathe Chuck Reversible Jaws +. 0039″ TIR Runout Certificate NEW. Both side of jaw teeth and guides are ground and hardened to HRC 58-62. Internal Jaw External Jaw. Semi-steel chuck body made from high quality cast iron.