The 3-door design creates more opportunities for dog owners to interact with their furry friends. The big opening in front is suitable for pets in and out, the small door makes feeding easier. Besides, as a major privilege of our dog cage, the top skylight design brings in a sense of cozy and belonging. Each cage has a front door and a Roof Door, both doors locked with 2 patent latches. These pet crates also have an ultra-durable, multi-layer finish that is much stronger than the "electro" or "powder" coats seen in inferior cages. This hammertone finish is rust, corrosion, and fade-resistant. Suitable for outdoor and indoor use. Please do not make the screws tighten when you first connect the parts, after the construction correctly, then tight all the screws.