CXA #4 QUICK CHANGE BORING BAR TOOL POST 250-304. For use with CXA tool posts 250-300 or 250-333. Equipped with a split bushing to accommodate a boring bar of smaller diameter. Holds 3/4″ tool with bushing, 1″ diameter without bushing. Interchangeable with Dorian, Aloris, & Phase II CXA series tool posts. While we guarantee your satisfaction, these especially work best with our matching tool posts. Precision ground and hardened. Completely sealed for maintenance free operation. 4PCS QUICK CHANGE BORING BAR TOOL POST Holder CXA #4 250-304 Heavy Duty For Lathe. 4PCS CXA #4 250-304 Heavy Duty Quick Change Tool Post Boring Bar Holder 13-18. Quick Change Tool Post. If there is any fault or problem with the product, please don’t be shy to express it, we will solve it at the first time. Metal Cut Off Wheels.