This is a spring-loaded 7/8 in. diameter nylon roller guide in a steel nail down base. The base is 3/8 in. with 2 nail down tabs on either side. It mounts on the top edge of a bi-fold door that is 1 in. to 1-3/8 in. thick and up to 30 lbs.
Spring-loaded steel base
Base is 3/8 in. diameter with two nail down tabs
7/8 in. nylon roller guide
Used by a variety of bi-fold door manufacturers
Fasteners included
Easy to install
For further dimensional information, please see the line drawing