BOSTAR 5C Collet Chuck (Plain Back). Recessed 3.740″Diameter x 0.184″ Deep. Should be Used With Back Plate (Adapter). To connect with Your Specific Lathe Spindle. Can Use Any Size 5C Collet From 1/16 through 1-1/8. Scroll and Pinion Design just like 3-Jaw Chuck , Operated With Chuck Kay. Scroll & Pinion Precision Machined and Hardened. […]