Solid Brass Oil Rubbed Bronze Small Square Interior Shelf Clamp. Designed to be used to secure a shelf for lightweight articles. Clamps should be secured to wall with screws (included) in studs, or with Molly-type anchors. A Nylon tip brass set screw secure the glass. Maximum 5" (127 mm) glass protrusion from wall is recommended. Recommended use tempered glass for shelve. 1-1/8"(29mm) Wide x 1"(25mm)Deep.