Cages have 14g. galvanized before welding wire. Sides, Top. Bottom wire 14 gauge galvanized after welding. Door is on 18" side. These cages aren't designed to work with trays.You will need clip pliers. These cages are knocked down for cheaper shipping. Clips and door latch are included in the kit. This size cage must be ordered in at least agoup of two. Otherwise they will get damageds in shipping. The other cage can be anything above 30" x 24".