Selby's Glass Shelf Non-Skid Locking Support locks glass into place with a nylon suction cup and fastening clip. It fits 3/16" to 1/4" thick glass. Includes a brass expansion bushing that is inserted into holes in the sidewall, and insertion of the steel screw opens the bushing to lock into the hole. Projection is 3/4" and the shelf is raised 11mm (7/16") above the hole location. The two pieces are sold as as set. The support has a nickel plated finish.