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The Tri-Arc KDSR112242-D2 gray, 12-step, steel rolling ladder measures 156 x 34 x 100 inches (Height x Base Width x Base Depth), has a 20” platform (H) with 36“ guardrail (H), and 24 x 7 inch steps (W x D). (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) The first step measures 10” (H), and the ladder has a serrated tread for slip resistance and drainage, knock-down construction, and a 450 lb. rated capacity. A locking system engages with a pedal release when the user steps on the first step. The ladder meets Occupational Safety & Health Administration (OSHA) 1910.29 standards for ladder safety and American National Standard Institute (ANSI) A14.7 standards for mobile ladder stands and platforms. Tri-Arc steel rolling ladders are often used in manufacturing, aviation, transportation, military, and other industrial environments. Tri-Arc manufactures mobile ladders, work platforms, and climbing and access products. The company, founded in 1959, is headquartered in Pittsburgh, PA. Assembly required; two people recommended for safety.