A must for every boater's tool box! Have you ever needed to change a propeller while on the water but never had the right tool? New from Invincible Marine is a Universal Prop Wrench. This lightweight, yet durable molded polymer wrench fits 1-1/16" propeller nuts. Engineered to fit Mercury engines over 50 H.P. and OMC engines over 40 H.P. Handle design lets you get enough torque on those hard to loosen propeller nuts.