Durham vertical cylinder storage cabinet holds 4 cylinders. 1-1/2-inches x 1/8-inches angle iron frame. Solid 14-gauge steel top and bottom. Expanded metal sides, back and door, for ventilation and visibility of contents. Accepts (2) 50 pounds cylinders. DANGER FLAMMABLE MATERIALS signs on door. Pre-punched lagging holes in feet. Heavy duty butt hinges prevent door sagging. Door has padlock hasp to secure contents (padlock not furnished). Magnet keeps door safely shut when not locked. In full compliance with OSHA and NFPA standards when used properly. Ships fully assembled. Durable safety yellow powder coat finish.