If your Ford F150 Crew Cab Four Door has the normal rust problems in the cab corners, this cover is an economic solution for you. Simply install the cover with the supplied push type rivets to cover that unsightly rusty area. The covers come as a set (Driver and Passenger side). The mounting hardware (push rivets) are supplied with the covers. Simply drill an 11/32" hole for each rivet, through the corner cover, push in the rivet to secure the cover. Some trimming will be required for fit. Each cover is manufactured using durable High Density Polyethylene. They are black in color and have a smooth / matte finish. The covers are resistant to the harsh chemicals used on wintery roads, U.V. resistant, and durable enough to take the abuses of everyday driving.