WC-21 Wheel Chock WC-21 wheel chock (RF-7 striped flag NOT included) WC-2 linked to WC-1 with chain For EXPOSED rail (60-141 lb) RF-7 striped flag not included WC-1 Wheel ChockWC-1F Wheel ChockWC-11 Wheel ChockWC-11F Wheel ChockWC-11-100 Wheel ChockWC-11-101 Wheel ChockWC-2 Wheel ChockWC-2F Wheel ChockWC-21 Wheel ChockWC-3 Wheel ChockWC-31 Wheel Chock