T-H Marine T H Marine Supplies Inc Prop Master Propeller Wrench. 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 1/16" propeller nuts without slipping or stripping. (OMC - over 40 HP Mercury - over 50 HP) High visibility color makes it easy to locate in dark boat compartments. The Prop Master also has a 9/16" garboard drain plug socket on the reverse side. Will not corrode in the salt water environment. Features of T-H Marine PMW-1-DP T H Marine Supplies Inc Prop Master Propeller Wrench Fits All 1-1/16 Prop Nuts (40hp & up) Rugged Nylon Resists Stripping 9/16" Garboard Drain Socket on Back Non-Corrosive in Salt Environment High Visibility Yellow makes wrench easy to find Package Contents: T-H Marine PMW-1-DP T H Marine Supplies Inc Prop Master Propeller Wrench T-H Marine PMW-1-DP: T H Marine Supplies Inc Prop Master Propeller Wrench