Professional's Choice Medium Lifter Series - Mullen Mouth"In the Lifter bits there are two different shanks, each with four different mouthpieces. The medium measures 6 and the long measures 8. This gives the rider lots of different options to choose from. These bits are for all different types of horses, from the light horse that needs help on the back side or the hard runner that needs help shutting down for the turn. These bits are created to help you pick up your horse's shoulder while going into turn