Dewalt High Performance DW8405 Grinding Wheel, Type 27, Outside Diameter: 4-1/2 Inch, Thickness: 1/4 Inch, Arbor Hole / Thread Size: 5/8-11 Thread, Grade: N, Grit: 30, Abrasive Type: Aluminum Oxide, Bond Type: Premium Resin, Max Speed: 13300 Rpm, Mounting: Threaded, Product / Materials Abraded: Aluminum For Additional Product Information, Click Here