These bi-fold door knobs are constructed of diecast and come in a brass plated finish. They feature knobs with a large 1-3/4 in. diameter pull for easy gripping, and a 3/4 in. outside diameter base. These knobs have a 9/16 in. projection, and they can be installed on hollow core and solid doors. This pack of 5 bi-fold door knobs comes complete with 5 fasteners, they are simple to install and used by a variety of wardrobe door manufacturers.