Quick release extensions come in 2”, 3”, 4”, and 8” lengths. They are also stackable for a total length of 17” or many combinations in between. These are made to fit into Predator cues (M14x2.0). If your cue does not have this size hole it can be modified to accept these extensions. I have also made adapters to fit Teddy Harris Custom Cues as an option requiring a modification that is included in the "complete set" price.