150mm x 20mm x 25mm hole. Perfect for buffing up wax polish on woodturning projects. Unstitched so rather floppy at low speeds. Run above 2000 rpm. Max rpm 12000. Will fit on a grinder but you might have to turn up a wooden bush to adapt the 25mm bore to your grinder shaft diameter (most grinders are 1/2 inch). Two can go side by side if you want as it will compress to 12mm. Also can be used on a lathe with suitable fitting. 100 percent supersoft cotton.