This is a genuine VW Volkswagen disc brake caliper with the part number 3AA615404. It is designed for use on VW vehicles and is used to apply pressure to the brake pads, allowing for smooth and efficient braking. This caliper is made from high-quality materials and is an essential component of the braking system in VW vehicles. It is a direct replacement for the original caliper and is designed to meet the same specifications for optimal performance and safety.