POWERTEC 15505 White Aluminum Oxide Grinding Wheel, 8-Inch by 1-Inch, 5/8-Inch Arbor, 120 Grit Made of White Aluminum Oxide with a Vitrified bond Designed to fit most stationary bench grinders Ideal for Steel Applications Size: 8-Inch x 1-Inch; Arbor size: 5/8-Inch, 120 Grit