The Original Stump Machine. Praxis Stump Machines are world class and made with only the highest quality commercial-grade components. Easy to operate; you'll watch as tree stumps disappear under its power. Features a patented 12-toothed tungsten carbide tipped Quadrublade that insures the smoothest cutting experience of any walk behind Stump Machine on the market. Its ergonomically designed handle provides a comfortable grip and sure footing, which makes this Stump Machine easy to maneuver and safe to operate. Do more with less fatigue. U.S.A. Engine: Honda, Engine Type: GX270, Walk or Pull: Walk, Material Type: Thick gauge steel, Tire Size (in.): 9 1/2 x 3/8, Dimensions L x W x H (in.): 71 x 26 1/2 x 40