The Proteus Cage serves as a light, stiff and rock solid handle for your 35mm adapter, HD cam, or ENG cam rig. You can mount up to three of our universal rails blocks allowing the mounting of additional 15mm rails on either the side or top of the rig. The unit is 100% computer machined from aluminum, computer bent and then powder coated black for a lifetime of use. The cage is only .85kg, or 1.8 lbs in weight and will support rigs well over 40lbs if required.