BED RISERS RND BLK by Creative Bath Customize to your own needs The bed leg or caster fits safely and securely into the recess cup built into the bed riser The small bed riser nests securely over the locking ring on the large bed riser, without sliding Small risers lift your bed up 3, while the large risers lift up to 5 Stack the risers together for raising your bed up to 8 inches from the floor