Hand tool, which consists of a long base plate with a sharply angled cutting blade, extending through the slot in the base. When the base plate is slid along a piece of wood, the blade shaves off thin layers of the wood, unless the extension is adjusted for thicker layers.
A jack plane is the general-purpose bench plane, used for general smoothing of the edges and sizing of wood. Jack planes are about 15 inches long, and the blade usually has a moderately curved edge. In preparing stock, the jack plane is used after the scrub plane and before the smooth plane.