These Chucks Are Available with 3 Jaw and 4 Jaw and are referred as STC-3 and STC-4 respectively.
STC-3 Chuck are most populer. STC-4 Chuck are Used when the job is Square of to grip jobs having
thin walls as holding pressure is divided on four side.
One set of reverse jaws, Mounting Bolts, Operating Key and Inspection Reports is Provided with each Chuck