Hot dip galvanized low carbon steel 1-7/8" neck rail bracket with 2-3/8" U bolt Heavy duty 1/4" thick steel 1/2" U bolt rod diameter with 1/2"-13 thread size 2.9 lbs per clamp, 5.8 lbs for 2 clamps 2 Pack U-Bolt cross clamps for connecting posts and rails, suitable for use in greenhouses, chain-link fences, and cattle stall barns Specification Material: low carbon steel Finish: hot dip galvanized Thickness: 1/4" Fit tube size: 1-7/8" x 2-3/8" OD U bolt rod diameter: 1/2" Thread size: 1/2"-13 U bolt size: 4-1/8" x 3-3/8" x 1/2" Half clamps size: 4-7/8" x 4-1/8" x 2" Package size: 6-7/8" x 6-1/8" x 3-1/8" Weight: 2.9 lbs per clamp, 5.8 lbs for 2 clamps Packing List 2 x U Bolt Pipe Clamps