Patent ID: 8286291

Claim:
An eraser disk for a rotary tool, comprising: an axis of rotation; and, an upper surface and a lower surface opposite said upper surface, wherein: said upper surface includes: a central recess; a plurality of protrusions for abrading a workpiece; and an aperture in said recess keyed for axial alignment with a central opening of an eraser hub; said lower surface comprises a plurality of mounting elevations or protrusions extending from a recessed portion of the lower surface and keyed for engaging and locking in spaced apertures or slots in the eraser hub for detachably affixing said eraser disk to said eraser hub; the upper surface is formed of a single piece of material; respective distal ends of the mounting elevations or protrusions form respective portions of the lower surface furthest from the upper surface in a direction parallel to the axis of rotation; the plurality of protrusions for abrading the workpiece forms a single unit formed from the single piece of material; the plurality of protrusions for abrading the workpiece is displaced and aligned from the central recess to a peripheral edge of said eraser disk in a direction orthogonal to the axis of rotation; each mounting elevation or protrusion in the plurality of spaced mounting elevations or protrusions includes a respective ring or cap at the respective distal end for engaging with apertures or slots of the eraser hub for detachably affixing said eraser disk to said eraser hub; and, a greatest width of the respective ring or cap in the direction is greater than a greatest width of said each mounting elevation or protrusion in the direction.