The 7 Shank is has quite a bit of weight behind the mouthpiece, which allows a quick release from the rider’s hands.  This is an excellent transition bit out of an O-ring or D-ring.  The wide ported chain mouthpiece is a step up from a traditional ported chain bit. It does not have quite as much tongue relief and is a little more aggressive on the tongue and the pallet.  

Mouth: 5 1/8" Cheek: 6 1/2"