This is the same billet aluminum clamp as supplied with our 9922-001 through 9922-006 exhaust pipe cradle mounts. The self-centering clamp design can fit chassis tubes between 16mm and 25mm (5/8" ro 1") diameter. The black anodized clamp includes an 8mm clamp screw.
To assemble, remove the screw from the clamp assembly. Insert the screw through an 8mm or 5/16" hole in your bracket and reinstall the screw in the clamp. Tighten the clamp onto your tubing while holding your bracket in position.