Jacobs Spindle Nose Lathe Chuck with 11 Rubber Flex Collets. See pics of inner chuck threads. The threads are 2-3/8-6 tpi. There is a small portion of damaged threads please look at pictures. Comes with the following flex collets. 1 J910 1/16 & 1/8. 2 J911 1/8 & 1/4. 3 J912 1/4 & 3/8. 4 […]