150mm x 15mm x 12mm hole. Perfect for buffing up wax polish on woodturning projects. Firmer than unstitched mop. Run above 1000 rpm. Max rpm 8000. Will fit nicely on 1/2 inch grinder shaft direct. 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.