The recommended cage spacing is 3-6 cm (1.2-2.4 inches). Please carefully measure the cage spacing to ensure compatibility before purchasing. This helps avoid issues with cage bars being too close for the feeder to fit. Perfect size for cage: 10.8 x 16 x 22 cm food feeder and 10 x 15 x 20 cm water dispenser with a capacity of up to 800 ml. Bowls with 4.2 inches and 3.3 inches in diameter are ideal for small animals such as rabbits, chinchillas, guinea pigs, hedgehogs, and ferrets. Knob hanging cage design: The hanging design maximizes space and is specially made for small pets kept in cages. Food and water can be refilled from outside the cage without disassembly, ensuring cleanliness and convenience. Safe material: Made of polypropylene, these feeders and dispensers are durable and can be washed at high temperatures. They can be disassembled into small parts for thorough cleaning and disinfection, and are easy to reassemble, helping you care for your pets efficiently. Hanging design: Designed to be mounted at an appropriate height to prevent neck strain when pets drink. The secure knob fitting is compatible with most small pet cages and allows installation from inside or outside as needed. Suitable capacity: The feeder and water dispenser have a 1-liter (35 oz) capacity, providing enough food and water for small pets for 3-5 days. Ideal for times when you are away or busy. Automatic gravity supply: Utilizes a natural gravity-fed system to continuously supply fresh water and food without the need for electricity, making it eco-friendly and reliable. Food preservation design: Features an improved design that helps keep pet food dry and fresh, supporting better health and hygiene for your pets.