Tri-Arc's Walk-Thru Fixed Steel Ladders are ideal for access to the roof, mezzanine or loading dock. This 18-inch wide ladder with powder coat gray finish has side rails constructed from 2-1/2-inch x 3/8-inch flat bar, solid round 3/4-inch slip-resistant rungs, and 12-inch spacing between the rungs. With a height of 16-feet from top to bottom rung, safety cage with flared bottom opening for easy entry, this model also has guardrails that extend 42-inches above landing surface. Tri-Arc’s Fixed Steel Ladders are engineered and manufactured in compliance with OSHA 1910.29 and ANSI A14.7 standards and made in the USA.