Strong, lightweight anodized aluminum construction. Easy Boarding for Swimmers or Divers with fins or heavy gear. Steps fold "parallel" in automatic unison for storage Dual aluminum center vertical rails for stable support while boarding. Optional storage brackets available for stowing folded ladder. Comfortable Ergonomic Designed Step- Black reinforced nylon with traction molded curved surface Heavy Duty - rated to 400 lbs. (181kg) boarding weight. Stainless Steel mounting bracket includes "Kick-up" feature if boat takes off with ladder in down position. 4 STEP MODEL : Stowed Dimensions: 4öx4öx50.25ö (10x10x128 cm), Length Deployed: 44ö (112 cm), Width: 15ö (38 cm)