20 Inch Diameter Mesh Floor Sanding Screen Discs. Floor Polisher – Floor Maintainer – Floor Buffer “Screen-Back”. 20 Diameter Screens in. Premium Floor Sanding Screens – 20 Mesh Discs are used for sanding in between coats of the final floor finish. They are available in the following grits with pack quantities. 60 Grit: Pack of 10. 80 Grit: Pack of 10. 100 Grit: Pack of 10. 120 Grit: Pack of 10. 150 Grit: Pack of 10. Used for sanding in between coats of the final floor finish. They are used in conjunction with a thick floor pad and plastic or wood floor pad driver. The weight of the machine holds the screens in place under the floor sander or floor polisher while sanding. Fits Most Floor Polishers that use a 20 Pad Driver and Pads: 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 screen and may not reflect the exact grit you will receive in this listing.