This 4 step ladder is manufactured with 1'' heavy wall aluminum tubing. All assembly hardware is stainless steel and assembly is quick and easy. An optional release kit is included. Simply tilt the ladder up and slide it out for storage and cleaning. Ladder can be mounted permanently with its pre-drilled holes. Rail height: 24 1/2'' above the dock. Distance to first step from dock surface is 12'' with 10.5'' between steps. Steps are 4 3/4'' deep and 15'' wide.