Variable Speed Jar Mill Planetary Ball Grinder 60-570RPM This jar mill is a rolling drum grinding machine for small batch powder milling. Jars are placed on the rotating rollers and tumbled at a controlled, variable speed for uniform grinding and mixing. Key Features Roller drive for smooth, uniform jar rotation Variable speed range 50-410RPM for gentle grinding Accepts 1L to 10L jars Available with 2 or 4 rollers Compact design for laboratory benches Technical Specifications