3/8-Inch arbor hole fits all brands of pneumatic 3-Inch cut-off tools Abrasive wheels are designed for cut-off applications involving angle-iron, rebar, steel and other metals For use in cutting sheet metal, metal hardware, or fasteners Comes with in plastic bin for easy storage ALWAYS use safety guard with cut-off wheels Thickness: 1/16-Inch Arbor hole: 3/8-Inch.