Professional's Choice Bob Avila Signature Shank Correction BitProfessional's Choice Bob Avila Signature Shank Correction Bit Mouthpiece Width: 5 1 4" Bar Width: 1 2" Purchase: 3" Shank: 5 1 4" Cheek: 8 1 4" Port Height: 2" Width: 1" Bit Material: Copper roller bars The four moving parts allow the horse to respond to subtle rein pressure. The higher port offers more control for horses that pull on the bit. NOTE: This bit will rust when exposed to moisture. This creates a sweet taste in the horse's mouth and