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.