5-Pack of Forney 71877 *Diameter: 4-1/2 in. *Thickness: 1/4 in. thick *Arbor Size: 7/8 in. *Product Type: Grinding Wheel *Number in Package: 5 pk *Compatibility: Right-Angle Grinders *Arbor Type: Type 27 *Packaging Type: Bulk *Maximum Speed: 13300 rpm *Discovery ACC