All-welded units ship set up. 13 gauge expanded metal for ventilation and visibility. Sloped roof is sheet steel. Angle frame with back panels reinforced for protection against slamming cylinders. Includes padlock hasp. Legs have 1/2 in. hole for bolting to floor. Stores upright four to six 20-43 lbs. cylinders up to 33 in. tall. Helps meet OSHA 1910 require- ments and NFPA standards. Yellow powder coated finish.