Norton  Metal  Grinding Wheel  4-1/2 in. D *Sub Brand: Metal *Diameter: 4-1/2 in. *Product Type: Grinding Wheel *Arbor Size: 7/8 in. *Thickness: 1/4 in. thick *Maximum Speed: 13,580 rpm *Abrasive Material: Aluminum Oxide *Compatibility: Stainless, Steel/Metal *Depressed center *Type 27