Secure design which holds coffee mugs with a handle, 12 oz. cans or drink insulators. Small ring for small drinks, large ring for larger drinks. When not in use, flip both rings down and close the cover for convenient storage. Open dimensions: 4 3/4" deep X 4 9/16" wide X 4 5/8" high. Closed depth: 7/8". Case is pre-drilled with four holes for #10 screws.