Double Jointed bit from Horse Guard, with loose rings and Lock Up function. Lock Up means that the central part locks, increasing pressure on the tongue and becoming sharper if the horse leans on the bit and pulls. In the locked position, the bit acts as a straight bit, making it easier for the rider to quickly regain contact without being as harsh on the horse's mouth.
In other words, this bit encourages a horse that pushes its tongue against the bit for control to come back and tuck in its nose, making it easier to control.
Material
Stainless steel