3 Inch Axle Tube Clamp-On Ring - 2 Bolt - 1-3/4 Inch Wide. Clamp-on rings fasten around most 3 Inch axle tubes to use as a starting point for building custom trailing arms, shock and spring mounts and many other uses. Rings are constructed using 3/16 Inch wall material and feature a 2-piece design for easy installation and removal.