Regarded as a lunge line attachment designed to clip on to both sides of the bit.
The issue is we don't see how a horse can be lunged successfully by doing this as the line of contact is all wrong and will cause a lot of cheek pressure from the bit that it is attached to and this will do nothing but irritate the horse.
However if you have to lead a horse in hand that is difficult to control such as a stallion with a bit in its mouth, under these conditions we can see a use for it by directing lead rope tension to both sides of the bit where the direction of pull is closer to the horse behind the chin and in a more backward direction.
Hook attachments at each end. Swivel clip to attach lunge rein.