Joystick builder stem 31 8mmthis joystick builder stem is fully cnc machined so it is light enough for your race bike yet strong enough for all mountain or enduro rides featuring joysticks unique controlled clamping system this builder stem adopts a unique carbon and alloy friendly barstem interface with an improved clamping surface to give unparalleled strength and precision this means you can tackle the toughest bone shaker trails without worrying about stem failure featuresclamp3