Thule Aeroblade Edge Rail System - Black, Small/Medium SizeA Strong, Low Profile And Aerodynamic Rack System. Integrated Bar And Foot Design. Wind Diffuser Technology To Reduce Noise And Drag For Improved Fuel Economy. Boxbeam Load Bar Structure Gives The Load Bars Their Strength. Pre Assembled. One Bar With Integrated Feet Per Package To Accommodate The Aerodynamic Front To Rear Taper Of Many Vehicles. T Track Compatible For Fast Mounting. For Use With Factory Side Rails. Compatible With One Key Lock Cores.