Prevents tools from loosening the prop
Protects from theft
Does not hinder prop operation
Innovative McGard propeller locks are designed with a free spinning collar that prevents tools from loosening the prop. Protect from theft during use and in storage. Fits Mercruiser Stern Drives: Alpha I, Bravo I, TRS; OMC Stern Drives: Cobra and King Cobra; Mercury, Mariner Outboards: 70 hp and larger; Johnson, Evinrude Outboards: 140 hp and larger, and Volvo SX :motors up to '99.