IHB stands for “Independent Hinge Block”. This system allows you to replace the lower pillow ball mount for the plastic arms with a simple hinge block.
Each block uses a 3.0mm hinge and can accept aftermarket arms up to 33mm wide, thus allowing you to run Y arms and increase your turning radius.
Each block brings an M3x50 steel hinge and set screw to lock it in position. No Modification required.
This Hop-up is also compatible with the FS01D chassis. Furthermore, it can be adapted to the front of the XXX-D chassis running in 2WD when the differential case and diff are removed.