76-7500B Cephalometric Unit (split, two piece unit). Complete (split unit, without connecting rails). This unit is more versatile because it can be mounted on either side of the x-ray, on the same wall or adjacent wall. It can be easily customized to adapt to any office design. Included with this Ceph unit is a Box-Type Collimator for quick and simple positioning and alignment of the x-ray PID.