N 6705 is a spring loaded, 3/4 in square glide or 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. Used by Alliance Doors and many bi-fold door manufacturers.
Spring-loaded plastic base
3/4 in horizontal glide or guide mounted on a spring loaded shaft in the plastic base
Used on Alliance bi-fold doors as well as many bi-fold door manufacturers