Our 4-jaw chucks are available in two different sizes, and in independent jaw or self-centering jaw configurations. The smaller 2.5″ 4-jaw independent chucks are availble with 3/4-16 threads for use on Sherline machines. Other spindle threads are available to fit chucks by other manufacturers, such as 12 mm x 1 mm and 14 mm x 1 mm for older Unimat lathes or 1/2-20 for old 6″ Sears lathes.