Pet Pals ZW179 42 ProSelect Empire Cage Lrg S ProSelect Empire Dog Cages are quite possibly the world strongest dog cages. Designed specifically to contain powerful or aggressive dogs, these cages feature strong steel tubing, stout dual door latches and heavy-duty welding at stress points. Constructed to be the Alcatraz of pet cages, the 3/4 frame is forged from 20-gauge steel and reinforced by 1/2 diameter steel tubes for the strongest, sturdiest, most durable cage on the market. Designed specifically for powerful dogs that are able to claw or chew their way out of other cages and crates. Heavy-duty welds and stout dual door latches make these cages virtually indestructible. Finished in a long-lasting, high-grade hammertone for rust-resistance and durability. The cage includes a floor grate, steel tray, and four removable locking casters for added mobility.