The roof rack on my practicle prius

my versatile roof rack mounted to factory bolt holes with permanent mounts that screw into removable rack with 4 screws. total time to take rack on or off 5 minutes. paint protected with felt pads. weight capacity tested to 1000lbs centered on car.1 inch by 1/8 inch wall aluminum tube and box tube with mounts fabricated from 1/8 inch by 2 inch flat stock