A clamp is disclosed for coupling an accessory to a tube. The clamp includes a base configured to receive an accessory, and first and second arms rotatably coupled to the base by way of flexible members. Another flexible member adjoins ends of the first and second arms to define a continuous clamping surface for receiving the tube. The clamping surface has a size substantially identical to an outer diameter of the tube. A locking system is configured to restrict rotational and lateral movement of the first and second arms relative to each other.