All chucks individually inspected to ensure TIR of 0.0016 inch. Extra gripping torque style. Self-tightening mechanism automatically increases clamping force in proportion to torque increase during drilling to prevent tool slippage in clockwise rotation.Chuck has milled flats so it can be tightened with spanner wrench for more torque: up to three times more than hand tightening. Wrench is included.
Warning:This product may expose you to chemicals including Nickel, Chromium, or Lead, chemicals known to the State of California to cause Birth Defects and/or Cancer. For more information go to www.P65Warnings.ca.gov