This is a really interesting bit, clearly a quality bit. 5″ copper mouth, that rotates at the port and shank. What makes this bit so unique is the bottom of the correction port has a bar, which prevents the port from grabbing the tongue, while still offering the benefits of a correction bit, with a bit of action on the tongue. 5″ mouth, port measures 2″ to bottom of mouth, 2.25″ to bottom of bar closing the port, with 7.75″ swept back flat shanks. Nice quality, in very good used condition, with nice weight and feel.