Cook Mfg - Prop Master Propeller Wrench With 9/16" Garboard Drain Socket on Back Fits All 1-1/16" Prop Nuts - PMW1DPProp Master Propeller Wrench The Prop Master is the original molded propeller wrench. This 1 1 16" six point socket style prop wrench is made of high tensile strength, indestructible nylon. It is totally resistant to fuel, sun, salt water, and other chemicals. The Prop Master is less expensive than metal wrenches which rattle and can cause damage to your boat. However, it has plenty of brawn to get the job done. The Prop Master will tighten all 1 1