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The counter balancer equipped inside of chuck, compensates chucking power loss caused by centrifugal force at high speed rotation. This chuck is therefore used for high speed rotation. Stable chucking, powerful machining and shortened machining time are possible with this chuck as chucking power cariation is small by high speed.

The machining of long bar is possible as the center of the chuck is opened. It can be directly attached to ASA and JIS short taper spindle.