The Rhino Racks JB1714 59" Vortex Roof Rack System is the ideal solution for carrying kayaks, canoes, paddles boards, surfboards, cargo baskets, cargo boxes, and some trade/commercial accessories, while offering a stylish sporty look that'll complement your pickup truck. The Rhino-Rack JB1714 59" Vortex Bar Roof Rack system is designed to attach to existing tracks on your truck cap or hard top tonneau cover. Its also compatible with Retrax's PRO XR and One XR Trax Rail System. Does NOT fit Yakima or Thule tracks, unless you purchase additional adapter kits (Thule Adapter Kit T-FK1) (Yakima Adapter Kit T-FK-3). Note: If you're using this rack system on a Retrax Tonneau Cover please measure the width of your bed to determine if the 59" Vortex crossbars will be compatible with the width of your truck bed. The Rhino Rack Vortex bars (pair) are rated for approximately 165 lbs. The included rack components: RLT600 Quick Mount Legs (x4), Base Mounts and Track Hardware, Pair of 59" Black Vortex Bars, and 4 Keyed Locks.