Works exclusively with any Cuetec weight adjustable model. Quickly and easily adds 6″ to the overall length of the cue. Simply unscrew existing butt cap with bumper as if adjusting the weight. Screw in the Cuetec Smart Extension. Leave as is or swap back and forth as needed. Useful for making those hard to reach shots without a bridge. Conveniently fits in most cue case accessory pouches.