Depressed Center Wheel, Type 27, 5 in Dia, 1/4 in Thick, 5/8 Arbor, Hardness S CGW Abrasives Depressed Center Wheels- 1/4" Grinding, Type 27 WARNING: This product can expose you to glass wool fibers (inhalable and biopersistent), crystalline silica (airborne particles of respirabl, a chemical known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov Used With: Air & Electric Grinders Abrasive Material: White Aluminum Oxide Applicable Materials: Ferrous Metals; Stainless Steel Grit: 24 Speed [Max]: 12,300 rpm Hardness Grade: S Thickness [Nom]: 1/4 in Dia. [Nom]: 5 in Quantity: 10 per carton Arbor Thread - TPI or Pitch: 5/8 in - 11 Tool Shape: Type 27 Arbor Diam [Nom]: 5/8 in Applications: Grinding