Weaver Leather Professional “S“ Shank Bit, 5" Low Port Barrel Mouth, This black steel “S“ shank bit features a 5" low port barrel mouth, 7" cheeks and German silver diamond trim and copper dots. With mild to moderate leverage provided by the shank and mouthpieces, this series of bits was designed especially for performance horses in speed events where lift and quicker response are needed. This type of “S“ design is also great for horses that are prone to lipping the shank. Please note: Horses should never wear a bit when tied.