Trammell Josey Chain Nose Hackamore
From the manufacturer:
This hackamore was designed by a renowned barrel horse trainer to prevent cocking, pinching, and blocking that occur with a standard hackamore bit. When you got to one rein on this bit, the opposite cheek collapses against the side of the head, making this an excellent turning tool to bend colts' heads and correct old horses' problems. This can be a strong stopping bit and should be ridden light handed. The chain nose is adjustable on each side and should ride on the upper hard area of the nose. It can be tied to the headstall with string or leather. This hackamore has also proven to be a good bit on rope horses.