B 40RL500: Expo Truss 40R - Length 500 mm B 40RL710: Expo Truss 40R - Length 710 mm B 40RL1000: Expo Truss 40R - Length 1000 mm B 40RL2000: Expo Truss 40R - Length 2000 mm B 40RL3000: Expo Truss 40R - Length 3000 mm