If you own one of our older brake tools and want to upgrade to the new combination wrench, here is your opportunity. This new wrench is better fitting on the brake tool and has a BONUS 15 mm flat spanner in the opposite end. Why 15 mm? Many of the VW/Audi calipers require a narrow 15 mm to remove the caliper from the guide pins. Maybe you already own non-Metalnerd brake tool kit but want a thin 15 mm for your brake jobs. Heat treated steel with a zinc finish. USA