The D-Ram Clamp is a useful mount when you are not able to drill holes in the attachment point. Just mount the clamp the the beam and tighten the bolts and you are ready to go.
Recommended max load is about 6.75 kg.
There are different options for the size of the clamp to fit your needs.
1.5", 1.7", 2", 2.5", 3", 4"