Circle plane. The shape from the top is like the side view of a sombrero. Flat on top, at the start of the middle curvature on the right, there is the chip hole measuring 2.7/1.6x2.5 cm and the wooden wedge, which is held by a metal plate measuring 43x12x3 mm with two bronze screws. The right side in the middle is rounded out over 26 cm. At the front and back, two handles, each measuring 4.3x2.3 cm, sweep outwards. The sole is flat with 5 small irons, each 17 mm wide and 25-30 mm long, and two large ones, 22 mm wide and 60/40 mm long, all with two screws, to protect the curved wooden sole. As an internal stop, a 1 cm wooden circular section, 24 cm long and up to 5.1 cm wide, is attached with three screws. The left inner side is flat up to the handles at the front and back. The plane is suitable for internal diameters of 36 cm and larger, with wall thicknesses of up to 2 cm.