These are replacement steps. They do not come with the fixings and so it is cheaper to replace when your step becomes worn, chewed or dirty. These steps are designed specifically with degus in mind they are hand-made from degu-safe materials and provide hours of fun for your inquisitive pets and a safe, comfortable place for your Degu to perch. Our Degus love these little steps and use them to climb on and aid their way to other levels in the cage. The step is held securely in place with a bolt, which fits almost all cages by a wingnut and washer (not provided with this product - it is a refill only) on the outside of the cage and they can be placed anywhere in the cage unlike some platforms. Your pets will love to run and climb on these steps which can be attached to the side of the cage to provide access to other levels of the cage. Combine these with our range of shelves and tubes to create new levels in your cage and a dynamic play area for your pet. Please visit our shop to see our full range of products (which is where you will find the steps with the bolts)