This Balance Rite forward weighted pool cue extension is for a 5/16×18 Threaded Joint. The Balance Rite 4\

This Balance Rite forward weighted pool cue extension is for a 5/16×18 Threaded Joint. The Balance Rite 4″ extension fits between your shaft and butt to give you the extra length you need on some shots. The Extension weighs ~2oz. and is designed to be used on every shot.