Being a type without a penetration hole in the chuck, it is the most economical type when the work is not done by penetrating the bar materials through the main axis of a lathe.
Grinded after the high frequency heating, the side of the Jaw in the main part has excellent wearability and durability so that it is best suitable for the machine used exclusively for mass production.
Since grease is injected through the Nipple of the Master Jaw, the friction sides do not burn and stick together, and the high purity ensures the excellent durability.