Constructed of anodized aluminum and stainless steel for years of dependable service in the marine environment. Four stainless-steel casters create smooth contact with dock while boat is free to move with current and tide. The stowable design folds for compact storage. Mounting is quick and easy to permanently installed, self-locking, stainless-steel catch pads that are provided with each set of stairs. Boarding stairs include stainless-steel casters (with grease fittings), one handrail, non-skid tread, one set of mounting brackets. 8-3/4" step depth.