Defeat stern drive thieves with the McGard Stern Drive Lock for MerCruiser. It's made of naval brass and hardened stainless steel and features a free-spinning collar that turns if attacked by gripping tools. It's easy to use and install and provides added peace of mind and protection for your valuable marine investment.

• Fits Mercruiser Alpha & Bravo, OMC Cobra & King Cobra stern drives
• Provides protection from stern drive theft
• Made of naval brass & hardened stainless steel
• Features a free-spinning collar that turns if attacked by gripping tools
• Simply replace one of the nuts holding the stern drive & tighten with included key tool
• 7/16 in. - 20 thread size
• McGard part number 74018
• Weight: Approximately .63 pounds
• Shipping Dimensions: Approximately 8 x 6 x 2 inches.