The best protection available against costly propeller theft. 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 outboard motors: Johnson/Evinrude 40-140 hp (2 stroke) (some 90hp-130hp may have a 3/4-16 shaft). This product may contain globally sourced materials/components.