If you made a decision to re-upholster your OEM seats, the seat set doesn't come with these bezels. No seat is complete without proper trim. These are steel anodized black bezels, 7 mm deep. They are precisely made to the diameter of the OEM knob. To install these bezels, after you completed seat upholstery, simply find the retaining hole on the back of the seat, cut no more than half inch round opening. Apply small amount of Crazy glue around the inner perimeter of the bezel and slowly insert bezel on to it's place. See pictures. We offer two bezels for two seats.