Durham horizontal cylinder storage cabinet holds 4 cylinders. There are solid 14-gauge steel top and bottom. There are expanded metal sides, back and door, for ventilation and visibility of contents. Accepts 20 pounds and 33-1/2 pounds LPG cylinders. Cylinder cradles securely hold propane tanks in place. 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. It is in full compliance with OSHA and NFPA standards when used properly. Durable safety yellow powder coat finish.