Mcgard Propeller Lock #371-74039

• MerCruiser Alpha I, Bravo I(Incl. X & XR), TRS, Vazer, OMC Cobra and King Cobra 
• Threads: 3/4-16"
• 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.