Northfield Precision Instrument Corporation, a manufacturer of precision workholding chucks, introduces their special six inch diameter, six-jaw chuck with 1/2" of jaw stroke on diameter and a 1/2" counter bore in the center. It has sub-jaws, inserts and a special air ejector that is spring return. This chuck was designed for Tiffany Co., the jewelry store. It is used to make gold and platinum rings that are bar fed from the main spindle and finished in the sub-spindle on this Northfield chuck. It is rated for 4,000 rpm with low profile jaws. Northfield Precision designs and manufactures air chucks for any lathe, boring machine, grinder or VMC. Models include through-hole, high-speed and quick-change. Available in SAE or metric, in sizes from 3" (76 mm) to 18" (457 mm). Accuracies of 0.001" to 0.00001" (0.254 m) guaranteed.