The Robert Sorby Eccentric Chuck is the most sophisticated chuck for multicentered turning. Ease and accuracy of adjustment, without removing the workpiece from the chuck, are provided by the unique offset boss, which accommodates three different driving components for mounting your workpieces. The Eccentric Chuck provides the means of driving from the headstock with or without tailstock support. The boss can be offset incrementally by 1-1/4" (30mm) from the zero datum point. The amount of offset will be indicated on the side of the chuck as it is rotated to change the amount of eccentricity. Not only is the chuck precise, but it is also repeatable, and it offers three methods of holding a workpiece: the 2-1/8" faceplate for bowls and platters, a 10mm screw for finials, and the hexagonal socket drive used on spindle work.