Keep your engine's lower unit safe from theft by using this Panther motor security lock. Tamper-resistant nuts and bolts with unique pin configurations are designed to replace the existing nuts and bolts on your outboard. High-strength bell washer inhibits thieves from utilizing any other clamping device. Constructed of marine-grade stainless steel for corrosion resistance, the lock system is easily installed. Locking system replaces current engine hardware Marine-grade stainless steel construction | Lower Unit Security Lock For Yamaha With 25" Shaft, Twin Engine