Shars Tool 6" x 1.259"HT American Standard Tongue & Groove Soft Steel Chuck Jaw Set

-Made of steel 1045 hot roll which is stronger, hardenable, easier to finish, and more fatigue resistant compared to 1018 cold roll. Hot roll steel will have less internal stress than cold roll and it will be more stable than cold roll after machining.
-Precision ground finish on contact face of Tongue to provide a tight fit with the master jaw of the lathe chuck
-Bottom surface of the jaws are precision ground and lapped to make maximum contact with the top of the master jaw
-Each jaw is stamped with a sequential number
-Supplies maximum concentricity on finish turning operation
-Can be bored or turned to customized workpiece.