Anodized Aluminum Cross Bars And Rails. Aluminum Uprights Support A Maximum Evenly Distributed 500lb Load. Aluminum Stake Pocket Inserts. No Drilling Required. Aerodynamic Design With Tie Down Openings At Top. Quickly Remove Or Reposition. Rapidly Secure Cargo Or Attach Accessories. Can Be Used With Or Without Uprights. Secure And Stabilize Payload With 4 Included Load Dividers. Anti-Vibration/Anti-Slip Rubber Channel Insert. Works With ACCESS Roll-Up Covers. Works With Most Inside T