These chucks are available with 3 jaws, 4 jaws and 6 jaws and are referred as BBC-3, BBC-4 and BBC-6 respectively. These are similar to Normal Standard Chucks, the only difference is that the bore is larger than normal Chucks. These chucks are used where machine is lighter and the job requires large bore in the chuck. One set of Reverse Jaws, Mounting bolts, Operating Key and inspection report is provided with each chuck.