3" Diamond-Plated Steel Cut-Off Wheel for Metal, Glass - 1/4" Shank fits Power Drills Die Grinders High-speed cut-off wheel for use on steel, aluminum, copper, glass, plastic and more Extra-large 3" diameter for larger cuts Steel disc has diamond particle abrasive electroplated on both sides for cutting hardest material Includes screw mandrel with 1/4" shank, 1-1/2" length Fits power drills, die-grinders and other power tools