Comes in a set of (4) four rails: left/right side front foot rails and left/right side rear foot rails Fits to the existing mounting points on the Isuzu MU-X 2021+ existing mounting points. No drilling or modification required. Foot rails follow the contours of the vehicle's roof line providing a sturdy base to fit Front Runner Roof Racks. Made of steel and sealed with the same durable, weather-resistant powder coating as Front Runner Racks. Installation hardware and fitting instructions included.