QueueMaster 550 Twin 3.4m x 50mm Belt Barrier SystemThe QM550 and QM550Twin are excellent value belt barriers that have some quality features that make them one of the best indoor queue control systems out there. The QM550 Twin has duel belts one running at approximately knee level, ideal for keeping children in line. The belts for these barriers are available in a variety of colours, patterns or with standard messages to suit almost any requirement. Custom messages and coloured belts can be produced