Specification: BRAND NEW CXA #4 QUICK CHANGE BORING BAR TOOL POST 250-304 For use with CXA tool posts 250-300 or 250-333. 13-18 swing 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 Weight: 5lbs Package Including: 4PCS QUICK CHANGE BORING BAR TOOL POST Holder CXA #4 250-304 Heavy Duty For Lathe.