Cart Armour CA-01 is an interlocking steel paneling system that encapsulates mobile work carts to secure them and their contents from theft. The patent pending design incorporates all 16 ga steel panels that can be installed in 15 min or less. The design also allows for installation on new carts or retro-fitting on existing cart models already in service, without having to modify the cart in any way. The recessed padlock design allows usage of a variety of padlocks, while keeping the lock free from snagging on doorways, materials, or clothing. Electrical pass-through with grommet allows power to be run to the interior of the cart while keeping the cord free from damage. The CA-01 fits Rubbermaid cart model 4520-88.