DESCRIPTION: * For Quick Change Tooling System. * Heavy Duty Boring Bar Holder for 10-15" swing Piston or Wedge tool posts. To hold max. 3/4" tool shank. * Equipped with a split bushing to accommodate a bar of smaller diameter. It grips bar with extreme rigidity, cuts smoothly without chatter. If you need to speak to a sales person feel free to call. We are open Monday through friday 8:30 to 5:00 est.