Batch mill suitable for dry grinding of hard and brittle substances up to 250 ml with a fixed speed of 20.000 rpm. - Double-walled grinding chamber can be cooled with water through two hose adapters - Removable grinding chamber, easy to clean - Two grinding chambers can be alternately operated using one drive - M 21 blade incl. with delivery Batch mill suitable for dry grinding of hard and brittle substances up to 250 ml with a fixed speed of 20.000 rpm. - Double-walled grinding chamber can be cooled with water through two hose adapters - Removable grinding chamber, easy to clean - Two grinding chambers can be alternately operated using one drive - M 21 blade incl. with delivery