Metal This metal kit comes with (4) 18" x 60" shelves, (4) 64" posts, (4) 5" polyurethane casters with brakes, and 1 security cage. Each of this security kit's 4 shelves can hold up to 450 lb., giving you the ability to securely store virtually anything. This item comes with 4 casters, allowing you to effortlessly move it from room to room. This mobile wire security cage kit can be locked easily with combination or key locks (sold separately) and is designed to keep expensive items and employee valuables locked up Heavy duty metal construction Safely store and transport valuable goods in commercial kitchens, labs, etc.