Protects your boat from dock contact and allows it to come close to the dock for easy passenger boarding. Includes 2ea: Base Stand Assemblies, Arm Assemblies, Spring Assemblies including Safety Sleeve, Line Assemblies, Shoulder Bolt with Nuts and Washers Automatically repositions your boat safely 3 ft. away from the dockSecurely moors boats up to 3500lb (1500kg)Adjustable tensionResists lateral, vertical and horizontal motion