The UltraGrinder by ArborWolf, Burnsville, Minn., has a radial piston motor for maximum productivity, a cushioned parallelogram mechanism for drivetrain protection and teeth on both sides of the cutting wheel to allow for dual-direction cutting. It also features Greenteeth technology as standard equipment.The UltraGrinder delivers the productivity of a dedicated stump grinder but at around one-fourth of the initial cost, according to the manufacturer. It is currently available for low- and high-flow skid steers from 16 to 45 gal. per minute (GPM), and versions for mini-skid steers and mini-excavators will be available soon.ArborWolf President and Product Development Manager Jerry Holman said that, compared to other stump grinder attachments, the UltraGrinder is as much as 150 percent more efficient.“This the most productive attachment-style stump grinder in the industry,” Holman said. “Our design makes it incredibly efficient while keeping it as simple as possible.”Plug-N-Grind