Traditional rear weighted balance right system comes with a special butt stopper and weight bolt attachment. This rear extension goes through a small hole in the butt stopper and screws directly in to the existing weight bolt system. Just change out your old butt stopper with the new one and screw in your extension! Instantly, hard to reach shots are easier. For use on Lucasi Custom, Lucasi Hybrid, Players, Players Pure X and Players FlirtFeatures:Fits 6 pool cue brands: Lucasi Hybrid, Lucasi Custom, Players, PureX, Players Flirt, DufferinLight weightInstalls and removes in seconds – works with all cue weightsFits behind your cue’s butt for maximum rear balanceEliminates the need for a bridge or oversized shaft