Size: 75mm, 90mm, 95mm, 105mm, 115mm, 140mm, 170mm, 220mm Hole diam.: 16mm or 22mm Suitable for Flap Discs Non-woven flap discs Clean stripe discs Felt discs Type: T-27 – Flat shape T27 T-29 – Conical or Tapered shape T29 Material Best quality fiberglass farbic Excellent phenolic resin Galvanized metal rings Backing surface: Black paper or non-woven cloth