Prime-Line N 6703 Roller Guide Nylon/Plastic Top Mounting 2/PK

N 6703 is a spring loaded, 7/8 in Dia nylon roller guide in a 3/8 in plastic base. It mounts on the top edge of a bi-fold door that is 1 to 1-3/8 in thick. Commonly used by Kenna Frame as well as countless other bi-fold door manufacturers.