Regular Capacity: Chrome finished carts have durable 11-gauge square base and 16-gauge mesh pattern sides to totally enclose load: can be locked to keep items secure. Equipped with 5 inch x 2 inch polyurethane casters: 2 rigid, 2 swivel. High Capacity: Equipped with 5 inch x 2 inch phenolic casters: 2 rigid, 2 swivel. Middle shelves not included order separately.