Small ball mill RJM30D is equipped with 3 adjustable roller and designed for reducing hard materials to powder. Digital table ball mill is generally used to grind material 7mm and finer, down to the particle size of 20 to 75 microns. BenchTop small ball mill RJM30D have fixed speed range and stepless speed change. Rollers are easily adjust to accommodate a variety of jar diameters (diameter of pot size is about 6.5cm~8.5cm). We have a wide range ball mill medias and mill jar, for example made by: stainless steel, zirconia, agate, corundum.