PC Derby Bit 6.75" ChainPC Derby Bit 6. 75" Chain BRB 301 This fixed cheek leverage bit is well suited for a finished horse. This shank creates lateral flexion and provides hip control which allows the horse to maintain balance while keeping their shoulders elevated during turns. This mouthpiece is soft and lies across the horse's tongue and bars comfortably without pinching. This mouthpiece offers good lift and flexibility. Mouth: 5 3 4" Cheek: 6 3 4"