The BMW 3 Button Prox (3B1) by Ilco is a must-have for locksmiths and key cutting professionals. This high-quality key is specifically designed to fit BMW 3 button prox (3B1) vehicles and must be programmed by a locksmith with the proper equipment. It is made from durable materials and is built to withstand everyday use. The key is the perfect replacement for lost or damaged keys, and is also great for use as a spare key. Keep your BMW 3 button prox (3B1) vehicles secure and accessible with the BMW 3 Button Prox (3B1) by Ilco.