These shaft inserts allow you to switch out the joint style on your Bull Carbon Fiber shaft so it is compatible with other pool cues. You no longer need to spend an extra $400 - $500+ to get a completely different Carbon Fiber Shaft to use on your various cues. These Bull Joint Adapters give you the option to easily change your Bull shaft from one joint style to another in seconds with the With just a few turns, the pin can be replaced with a completely different style! Available in Uniloc, Radial, 3/8 x 10, 5/16 x 14, and 5/16 x 18. Bring your cue customization to the next level with Bull. *These joint adapters only work with the Bull Carbon Fiber shafts which are available in the standard 11.75mm and the advanced 12.25mm tip sizes