These Ready-to-Assemble rings are shipped in 3 arched segments. The segments can be bolted together, end-to-end, to make a full 48-inch Clamp ring. A big advantage of these R-T-A rings is that the segments fit into a boxed that can be sent UPS. The outer ring is approximately 48" diameter and the inner ring is 1-1/2" smaller. The clamps are welded approx. 4" apart all around the ring. The joining plates at the ends of each arched segment are where the included bolts and nuts are used to assembled the ring. They are great for making giant wreaths--the outside diameter the finished wreath should be 54" to 60".