This ladder is manufactured with 1" heavy wall aluminum tubing. All assembly hardware is stainless steel and assembly is quick and easy. Quick release kit included. Simply tilt the ladder up and slide it out for storage and cleaning, or mount the ladder permanently with its pre-drilled holes. Rail height :24 1/2'' above the dockDistance to first step from dock surface :12''Distance between steps: 10 1/2''Steps are 15'' W x 4 3/4'' D