These clamps are required to attach LNBs with a feed horn diameter of 40 mm (e.g. Universal V/H-LNB 0017/8194) to the mounts 0000/1634, 0000/1644, and 0000/1669. In addition, they are required for use in conjunction with EUTELASTRASAT mounts (0000/1655) in order to mount 40 mm LNBs here.