These are fully welded, 100% steel diamond plate platforms that attach to the racking system of Pro Series cages to allow users to perform step exercises in front of the cage. Step surface area measures 15 inches wide by 18 inches deep. The supporting structure is fully welded 3 x 2 inch steel with a one-piece steel sleeve with two 1-inch racking pins and a number window. Just rack it onto the front post at the desired height and make your legs scream.