The 22-555 13 in. portable thickness planer was designed for maximum stability, durability, and precision. The Four column design provides excellent stability for smooth, accurate planing over many years of use. The two polyurethane feed rollers make for a smooth no-slip grip on the workpiece and is positioned close to the cuttterhead to improve your workpiece’s finish. Don’t forget about the quick change knife system with dual edge disposable knives that let you change knives without difficult to use alignment jigs.