Protects Against Costly Propeller Theft In And Out Of The Water; Fits Outboard Motors: Honda 40 To 50 HP/ Nissan 40 HP And Larger/ Tohatsu 40 HP And Larger; 16 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