Model: NOR 66252829855 547-66252829855 Abrasive Material: Zirconia Alumina/Aluminum Oxide Blended Abrasive Trade Name: Charger Applicable Materials: Steel, Most Metals Arbor Thread - TPI or Pitch: 5/8 in - 11 Dia: 4.5 in Quantity: 20 per pack Speed: 13580 rpm [Max] Thickness: 1/4 in