The 13â belt in this model is the longest in any economy stanchion and is 75% longer than the industry standard 7. All QueueMaster stanchion models feature a braking system for slow, safe belt retraction and a locking belt end to prevent accidental release.. QueueMaster Twin 550, Black, 13' Dark Blue Belts QueueMaster is a range of high quality, low cost retractable barrier stanchions for forming customer queues or restricting access.