Lock works by stepping on bottom step to raise casters; rubber feet grip floor. Depress brake release to roll ladder.HEIGHT INCHES TO TOP STEP. 24W 15 Step Steel Rolling Ladder 14D Top Step" is in sale since Saturday, March 10, 2018. This item is in the category "Business & Industrial\Material Handling\Ladders, Scaffolding & Platforms\Rolling Ladders & Scaffolds". The seller is "y2-supply2013" and is located in USA. This item can be shipped to United States.