The Kunz #4 is a Bailey Pattern bench plane. The frog is adjusted to open and close the mouth. The irons and chipbreakers are made from high quality German tool steel. The soles are ground flat and do not deviate more than 0.003″ across their surface. Handles are composite. These Kunz planes are a great value and are easy to tune. 240mm (9 1/2″) long with a 50mm (2″) iron width.