OUR CORNERS RUN A FULL 3 1/2 INCHES TALL All items ARE coated with the #1 selling brand Heerculiner bedliner its the only polyurethane and rubber granule bed liner there is. It cost more than the rest, but we think you would want all of what you pay for... we start with the best diamond plate there is "3003 grade highly polished" then its scuffed sanded and prepped to accept the rubberized coating. We apply by roller 1 thick layer then let it dry for 48 hrs before we wrap them for sale. TO INSTALL: INSTALL THE CENTER PIECE FIRST, THEN YOU WILL NEED TO TUCK THE CORNER PIECE UNDER THE FENDER FLARE AND BEND AROUND THE CORNERS FOR THE BEST FIT. IF YOUR VEHICLE HAS A TIRE CARRIER YOU WILL NEED TO DRILL A 1/2" HOLE FOR THE RUBBER STOP. IT IS MARKED WHERE THE HOLE NEEDS TO GO. PLEASE NOTE: TO INSTALL YOU CAN USE RTV CAULK, 2 SIDED TAPE, SCREWS OR RIVETS. The corner pieces ship flat.