Description This is a traditional chain bit with a 5 1/8â mouthpiece. The shank is 7 Â½â long, which allows for ample leverage. The chain mouthpiece encourages significant bend in the horseâs body. The chain is mild and lengthens reaction time between horse and rider.Mouth: 5 1/8" Cheek: 7 1/2".NOTE: This bit will rust when exposed to moisture. This creates a sweet taste in the horses mouth and promotes salivation.