Protects Against Costly Propeller Theft In And Out Of The Water; Fits Stern Drives And Outboard Motors: Yamaha Stern Drives - All/ Honda 75 HP And Larger/ Suzuki 40 HP And Larger/ Yamaha 115 HP And Larger/ Johnson/ Evinrude 150 HP And Larger (4 Stroke); 18 Millimeter x 1.5 Inch Thread Size; 1.025 Inch Overall Length; 1-1/16 Inch Hex Size; Naval Brass And Stainless Steel; Includes 1 Lock And 1 Key