Only used when a wall object is hanging from one rod that is centered behind the object. Hide behind bottom rail of frame and it will balance the distance of both lower frame corners to the wall, about 1" or 1 3/4 " for the two sizes. Particularly useful on larger frames, and to lessen the likelihood of the top of a frame to hang away from the wall. Almost required when grouping multiple objects in a vertical stack from a single rod. Thumb screw actuated. Two sizes.
B1016BA - Small, 6¾" (17 cm) wide
B1016CA - Large, 12½" (32 cm) wide