Product Description:

• Super Heavy duty design. Extra large, extra strong. Chuck weighted over 3 lbs, with shank over 4 lbs. 
• Special quenching treated key parts increases durability.
• Suitable for drill presses or lathes spindle accepts R8 shank
• Jaws are specially engineered to achieve balance. 
• JT3 mounted.
• Chuck key and R8-JT3 arbor are also included in the package. 

• Clamping Range: 3/16" - 3/4".
• R8 Shank.
• Accuracy: 0.005"