Truck Upfitters' Yakima Rack Kit for track mounted racks - 4 Control Towers, 4 Landing Pads #1, 4 End caps, 4 Core Locks, & 2 Keys. Round Crossbars and Tracks required (sold separately). For use with Yakima Round bars and Yakima or Sportrack Tracks (not included) Includes everything in picture. All you need to complete a rack is roof tracks and any length Yakima round bars Perfect for Camper Shells, Truck Tops, Truck Canopy, Truck Caps, Truck Toppers Includes master key to install and remove core locks into towers. Also includes 2 keys. Weight capacity is approximately 160 lbs.