Northfield Precision Instrument Corporation, a designer and manufacturer of precision workholding chucks, introduces their Automobile Rubber Grip chuck. This special chuck grips automotive "rubber coupling" drive shaft joints. The small collet in the center grips a 14 mm I.D. to an accuracy of less than 1/10,000 in. T.I.R. The three extended fingers pass thru three bolt holes, expand, and "Face Clamp" only. These fingers simulate "Bolting" the flange in place the way it is used in the vehicles. Drive shafts are balanced from 3,500 rpm to over 6,000 rpm. Northfield Precision designs and manufactures the world's most accurate 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. Custom workholding chucks and jaws are available and free engineering assistance is offered.