Heat treating of the small end of the toolholder can vary and should be checked before using.  Our Thread Master provides a non-destructive test method for toolholders that are heat treated and finish ground.

• Made from hardened tool steel
• Includes one Standard Thread Master
  
  
  WARNING: The steel alloy used in this product contains chromium and nickel.  This product can expose you to chemicals including chromium and nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov