Frame any size or shape picture. Spring loaded arms of polished brass clamp and hold together any thickness up to 3/8 in. of glass, picture, mat, and any backing. Requires the rigidity of the glass and backing board. Spring loaded corner clips can be use to frame any size to the size intended plus one hanger bracket. Corner Clips and cord can support up to 60 lbs. #4500 Corner Clips for any size to 20 in. x 20 in. contain four corner clips and cord. #4600 and #5600B Corner Clips for any size to 30 in. x 30 in. contain four corner clips, cord, and hanger bracket.#5000 Poster sizes includes four corners clips, cord, four side clips, and one hanger bracket.