It should be in one of your gloveboxes or in the rear tire well where your tire changing tools and jack are located. If it is not there contact your Dealer, they should have provided you with one. They have tools to get it off also if you can't locate it.i got my winter wheels and tires in yesterday. I was so excited and wanted to change them out but i could not find the key to loosen the security lugnut. Anybody know where can i get one?