3 full sheets of fiberglass for durability and safety, Use of 100% virgin grain for enhanced removal and long life, Proprietary material mix to ensure premium performance, Premium resin bonds 100% inspected before use, Diameter: 4 1/2"", Arbor Thread - TPI or Pitch: 5/8"" - 11, Thickness: 1/4"", Grit: A30N, Speed: 13300 rpm [Max], Quantity: 10 per box, SKU: ORSNO61380