A miniature gripper jaw with serrations on the two main gripping surfaces. The outer diameter is 53mm, the inner one is 40mm and the central, non serrated hole is 10mm diameter. The jaws give an excellent grip on all sizes of work. Recommended range: 35-55mm internal, 50-70mm external. Although designed to fit the 80mm chucks they will also fit the 100mm and 125mm versions.