The Matthews Extendellini for the Matthellini centre jaw clamp is an ingenious accessory that allows you to extend the reach of any Matthellini centre jaw clamp by up to 25.4 cm (10 inches). Simply remove the removable jaw from the Matthellini clamp, screw the end of the Extendellini into the end of the Matthellini rod, replace the jaw, and the jaw's reach is increased by 25.4 cm. It is also possible to add another Extendellini (not included), for a total clamp reach extension of 50.8 cm (20 inches).