A bridle piece is a type of horse tack that is used to control the horse. It consists of a headstall, BIT, and reins. The BIT is the most important part of the bridle piece, as it is placed in the horse's mouth and is used to direct the horse. The BIT is usually made of metal and has two parts: the mouthpiece and the shanks. The mouthpiece is the part that goes into the horse's mouth, while the shanks are the long pieces that attach to the reins. The reins are then used to control the horse's movements.