RADIAL 30 1-1/8" - U.S. Patent RADIAL 40 1-5/8" - U.S. Patent RADIAL 52 2-1/8" - U.S. Patent RADIAL 65 2-1/2" - U.S. Patent RADIAL 80 3-1/8" - U.S. Patent RADIAL 100 3-7/8" - U.S. Patent END CAPS - JOINTS BINO BUMPER