There's nothing more frustrating than heading to the dock, ready to launch, only to realize your ignition key is nowhere to be found. The Mercury Marine Key Set 457 - 87-897716457 makes sure you've got the right backup - cut to exact factory specs for select Mercury ignition systems, so it slides in smooth and works every time.. This isn't a generic cut-and-hope-for-the-best key. It's a genuine Mercury part, made to match your ignition perfectly, preventing the kind of wear and tear that can come from forcing ill-fitting keys into place. Whether you're adding a spare for a second operator, replacing a lost key, or just making sure there's an extra in the glove box, this set delivers the reliability you need to keep the day running smoothly.. What sets this key set apart:. Precision-cut to fit specific Mercury ignition switches - no forcing, no damage. Genuine OEM design guarantees the right fit and function. Corrosion-resistant construction holds up to salt air, moisture, and marine co