2 Two New ILCO CU7 Uncut Key Blanks For Mercury, Mariner Outboard & Mercury Cruiser. More Than One Key Was Used Please Match Your Key To The Photo Before Ordering. CU7 Boat Key Blanks For Mercury, Mariner Outboard & Mercury Cruiser. Mercury, Mariner Outboard & Mercury Cruiser keys Boat Keys Boat Motor Boat Ignition Keys CU7 KEY BLANK