Thule TracRac SR Base Rail - Smooth sliding and adjustability due to custom fit base rail. Features • Quick installation without drilling into the truck • Requires Thule TracRac SR Overhead Rack or Thule Xsporter Pro Shift Overhead Rack (sold separately) Specifications • Dimensions (LxWxH): 81.5 x 4 x 1.9 in • Model number: 21510 • Maximum load: Holds up to 1,250lbs/567 kgs when racks are properly installed and weight is distributed evenly. Vehicle limits may vary. Please check vehicle owners manual. • UPC-A: 721260215101 • Country of origin: USA