Prevent rust and grime from entering the box frame by blocking the square cutouts. The most vulnerable spot for water intrusion in most models is the metal box frame section right above the rear wheels. Hole covers can get brittle and damaged over time, replace any missing covers with this kit. Each purchase comes with two covers, one for each side. Some trucks will require more than one set. Please look around your frame to get an accurate count of how many you need.
