Meets Occupational Safety and Health Administration (OSHA) standards. Features 2 safety handrails. Mezzanine staircase includes closed tread steps with open riser. Staircase stringers are 14 D and made of formed channel structural grade steel that is pre-punched for bolted treads. Solid steel plate treads are embossed for a slip resistant surface. Stair guards are made of 1-1/2 square tubing and are welded to channel stringers for extra strength. Staircase guards are made of carbon structural steel and meet ASTM A36 specifications. Staircase measures 36″W overall.