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The Benefits of Having a Spare Key For Cars The dealership will usually give you two keys when you buy new cars. One will be your primary key, and the other will be your spare key. Dryer vents and power meters are great places to hide your spare car keys. Be sure they're not accessible and cannot be tampered. Peace of Mind The most obvious benefit of having a spare key is that it offers peace of mind. This is because it removes the anxiety of being locked out of your car. You can also swiftly and easily get into your