The Aviation Shure-Step II Nobby Top Measures 24" W x 13.5" W x 10" tall. It weighs 9 pounds and is load rated for 500 pounds. It was designed to be used during aircraft cabin tear out with 2 inch cut-aways around the base so air hoses and extension cords can run under the step. Very simialr to the Shure-Step II Nobby Top in that it is a stackable step stool. This step grows from 10 inches to 16 inches when stacked.