A cone hogger unit has axially juxtaposed cutting elements resembling circular saw blades that stepwise increase in diameter from one axial end of the unit. A cutting element intermediate the axial ends of the unit is integral with a body member that has opposite axially projecting hub-like portions, each extending through cutting elements at its axial side of said one cutting element. Circumferentially spaced screws, parallel to the unit axis and at one distance therefrom, pass through the smaller diameter cutting elements and are threaded into said one cutting element. The larger diameter elements are similarly secured by other screws at a greater distance from the unit axis.