Abstract: An elongated flat arm is joined at one end to the outer side of one of a pair of spaced apart legs, with that leg extending at about 90 degrees to the arm. The legs are joined together at one end, and are open ended at the other end. Inwardly directed cooperating projections are located adjacent the open end. A latch having a knobbed end is joined intermediate the length of the joined leg, and that latch extends towards and works in combination with an opening through the opposite leg to hold the legs together.