1.Self-tighting feature automatically increase gripping force proportion to increased torque to prevent tool shank slippage.
2.Positive lock mechanism prevents chucks from loosening in operational when suddenly stopped or in the reverse operation.
3.High precision, and high gripping force, high reliability and stability.
4.Flimsy parts are shaped by quenching.
5.The chuck is attached with a loosed key.It can be used loosen chuck When the clamping force was too strong.
6. size :13mm , 1/2-20UNF & 3/8-24UNF