20 Inch Floor Sanding Discs. Floor Polisher – Floor Maintainer – Floor Buffer. 20″ Diameter with 2″ Center Arbor Hole. Premium 20 Floor Sanding Aluminum Oxide Discs with a 2 Inch Center Arbor Hole. They are available in the following grits with pack quantities. 12 Grit: Pack of 20. 16 Grit: Pack of 20. 20 Grit: Pack of 20. 24 Grit: Pack of 20. 36 Grit: Pack of 20. 40 Grit: Pack of 20. 50 Grit: Pack of 20. 60 Grit: Pack of 20. 80 Grit: Pack of 20. 100 Grit: Pack of 2. Used for general floor sanding using a 20″ sandpaper driver that has a 2″ center arbor with flange and nut to secure the sandpaper. Fits Most Floor Polishers that use a 20″ Pad Sandpaper Driver for 20″ Diameter Discs with a 2 Arbor: Clarke, Sanitaire, Hawk, Unico, Tornado, Alto, Dayton, Mercury, Saturn. Ernie’s Supply also offers a complete selection of other grits and products which you may need to complete your project. Ernie’s Supply offers quality floor sandpaper and flooring abrasives. Thank you for your business and as always, we wish you success with your projects. Please note the picture is a general photo of a sandpaper disc and may not reflect the exact grit you will receive in this listing.