Westin Outback Series Heavy Duty Track Mount Rack Kits are heavy duty roof rack system that provides a strong, robust solution for transporting a variety of equipment. The durable crossbars are manufactured from extruded aluminum that has been clear anodized for long lasting corrosion protection. This kit also features an allen hex screw security system for added theft protection. Black rubber strips help cushion the load and provide a finished look. The load capacity is rated at 250 pounds and an extra crossbar of 125 pounds can also be added. Always check the manufacturers recommended specifications before installing. This system mounts to vehicle using the existing tracks for an easy, no-drill installation and the kit includes two 49" crossbars and four rails mount clamps.