This stainless steel bit is useful when control is an issue – the three rings offer leverage options to increase the severity. The 5″ and smaller sizes of this bit have smaller rings to ensure the bit remains in proportion. Mouthpiece thickness: 21mm. Cheek height: 160mm (4.5″, 5″), 180mm (5.5″, 6″). Stainless steel is the most common material for bits. Durable, easy to clean, tasteless and does not rust.