McGard Premium Propeller Lock Set For Honda/Yamaha/Suzuki M18 x 1.5 Thread Size. Once installed the McGard propeller lock offers 24 hour protection during use storage and transit. A free-spinning collar will turn if attacked by gripping tools without loosening the lock. Constructed of naval brass and hardened stainless steel for maximum security. Fits the following stern drives and outboard motors: Yamaha stern drives- All; Honda 75 hp and larger; Suzuki 40 hp and larger; Yamaha 90 hp and larger; Johnson/Evinrude 150 hp and larger (4 stroke). Features of McGard 74040 Premium Propeller Lock Set For Honda/Yamaha/Suzuki M18 x 1.5 Thread Size Best protection available against costly propeller theft Offers 24 hour protection during use storage and transit Constructed of naval brass and hardened stainless steel for maximum security See long description for compatibility Thread Size: M18 x 1.5; Hex Size: 1-1/16; Overall Length: 1.025 Package Contents: McGard 74040 Premium Propeller Lock Set For Honda/Yamaha/Suzuki M18 x 1.5 Thread Size McGard 74040: Premium Propeller Lock Set For Honda/Yamaha/Suzuki M18 x 1.5 Thread Size