Heavy duty design. Special quenching treated key parts increases durability. Suitable for drill presses or lathes spindle accepts 2MT shank. Jaws are specially engineered to achieve balance. JT3 mounted. Chuck key and MT2-JT3 arbor are also included in the package. Please note, the drill chuck and the shank together weighted over 5 lbs which is designed for drill press or Lathe but might not work for hand drill.