Zinger Professional Crate - Front/Side EntryAs a Professional model, this crate is perfect for "Escape Artist" pets who have a knack for breaking loose from ordinary dog crates. Like all Zinger crates, the Professional series crates are constructed from aircraft grade aluminum, and, built off the base of the Deluxe, features a reinforced door with extra bars, welds, and bracing. As an added layer of security, Professional series crates also include a secondary lock on the door frame, as well as