this stump grinder is on tracks. our fastest stump grinder rental by far. comes on trailer & takes a 2" ball. model toro stx-26 hydraulic stump grinder; controlled by levers. no belts. perfect for big jobs! specs cutting depth 12.5" below grade; cutting height 35" above grade; cutting wheel 19" diameter to tooth; 3/4" thick, 12 green teeth.