The MC-100-RL fixateur externe is 80% radiolucent. The weight of montages constructed with this kit amount to 1/4 of identical sized versions made with conventional metal components. It can be used to hold 8-5 mm rods and 5-3 mm bone screws. The inserts are interchangeable. The kits also provide stable angle drill bit guides. The MC-100-RL version includes all features of the MC-100 kit.