With a dr™ you don't have to put up with any stump, no matter where it is on your property.the dr pro stump grinder has a 306 cc briggs and stratton engine carbide tipped steel teeth.never again will you struggle with back breaking and time consuming methods of stump removal like digging by hand, ripping out with a tractor and chains, burning, or chemicals.the adjustable handlebars keep the operator comfortably in control. A simple, rugged design, with few moving parts, means this machine will be around for many years of fast stump removal.features8 carbide tipped cutting teeth replaceable are mounted to a ﾽ cutter head that supplies tremendous rotating inertia.cutter head is housed in a protective directional steel shroud which shows exactly where the cutting teeth are making contact, while protecting operator from thrown debris. Teeth are tipped with mining grade tungsten carbide...the same material used in the mining industry to drill through rock.the flip up belt cover protects the belt and pulleys, then flips out of the way for easy access. Self adjusting belt tensioner eliminates need for operator adjustment.specificationsmodel dr 9hp pro stump grinderengine briggs and stratton 306cccutter head thickness 1 2 cutter head diameter 10.5 tooth rpm speed 2789 88mphconstruction fully welded 12 gauge steeltorque 14.50 ft. Lbs. 2500 rpmcam case hardened steel chain driven overhead camstart recoil pullwheels steels tyres 15 x 4.75 luggedmachine weight 67kg 148lbsapprox machine dimensions 54.75 l x 35.5 w x 45.25 tmanufacturer's 2 year domestic warranty 90 days commercial