Thule 502 Load Stops are an adjustable solution for transporting a variety of loads on your vehicle's aerodynamic style cross bars. From construction materials to canoes Thule 502 Aero load stops adjust to fit the width of what you are carrying. The Thule 502 Aero Load Stops are designed to fit Thule Aeroblade, Xsporter, Xsporter Pro and Rapid Aero bars. Included are a set of four Load Stop brackets (one pair attaches to front load bar and one pair connects to rear load bar). Recommended for use in combination with a pair of Thule rack straps (not included).