Check the listing for details. 20 Pack - 3" Mini Flap Discs Quick Change Sanding Disc- 40 Grit. Condition: New. Listed at 29.99 USD. 20 Pack - 3" Mini Flap Discs 40 Grit Quick Change Sanding Roloc Style Type R The Professionals Choice Description: Quick Start- Zirconia Mini Flap Discs are a great option when seeking a long lasting abrasive that gets in those hard to reach spaces while lasting 10Xs longer than traditional quick change discs. Mini flap discs are similar to conventional flap discs but mount on a die grinder with a traditional roloc style backing pad. These discs are built for precision, durability and ease of use. The various grits offered can execute jobs from rough stock removal to fine finishing. Suitable For: All ferrous and non ferrous metals (Including Iron, Steel and Stainless Steel) Diameter: 3″ Fastener: Type R - Male Roll On (Compatible with / Equivalent to 3M Roloc fastening system) Grit: 40 Grit Type: T27 – Flat Face Grinding Surface Max Operating Speed: 30,000 RPM Material: Zirconia Use: Die Grinder (Needs Standard 3" Female Backing Pad) Quantity: 20 Discs