The Traxxas 6427 Battery Hold-Down Retainer is a high-quality electronic accessory designed to keep your batteries securely in place. This pack includes two pieces of the retainer, which are compatible with the XO-1 model. The Traxxas 6427 Battery Hold-Down Retainer is made from durable materials to ensure long-lasting use, and the pack size of 52 ensures that you'll always have a replacement on hand when you need it. Whether you're a professional racer or a hobbyist, the Traxxas 6427 Battery Hold-Down Retainer is an essential accessory for your electronic devices.