This Manfrotto Quick-Release C-Clamp is different from the other versions that are used mainly on round pipes, this version will also work on square and rectangular tubes. Extremely light, with a good -Inchcoupling range-Inch, this version also offers an incredible number of attachment sizes. Ideal for photographic applications and dedicated accessories. Pipe size 5-80mm. Attachment (bottom): 16mm; clamp range - max. (round tube): 3.15 in.; clamp range - min (round tube): 0.20 in.; color: black; load capacity: 15.43 lbs.; material: aluminum; weight: 1.26 lbs.