Each cage has a front door and a window, The front door locks with 2 patent latches.the window locks with 2 spring locks. These pet crate also have an ultra-durable, multi-layer finish that is much stronger than the "electro"or "powder"coats seen in inferior cages. This hammertone finished is rust, corrosion and fade resistant. Suitable for outdoor and indoor use. Every crate features 2 removable plastic pans. This design makes it easier to keep your pet clean and makes mess removal a breeze. Made from ABS for easy cleaning, The pan has an integrated lip around the perimeter to contain any mess. Both trays are held securely in place to prevent slipping but can be quickly removed for cleaning. These crates also feature 4 caster wheels, all of which lockable to prevent accidental movement. The crate ship partially assembled, require only minimal setup, and can be constructed in ten minutes. For maximum comfort, the crate should be sized 4" to 6" longer than the dog's body length, and 4" to 6" taller than its shoulder height. If the animal is not fully grown, please consult a breed chart to approximate the dog's future adult size, and choose a crate accordingly