Ball Mills reduce particle size by tumbling or rotating samples with grinding balls inside sealed jars, where impact and friction break materials down to fine and nano-scale powders. Adjustable speeds from 70 to 640 rpm control grinding energy, while timers and reversing modes support repeatable batch runs. Jar and ball materials such as stainless steel, agate, zirconia and alumina match sample hardness and limit contamination. Dry and wet grinding, mechanical alloying and homogenizing are possible in a single unit. Typical uses include ceramics, battery materials, geology, metallurgy, pharmaceuticals and chemistry labs preparing samples for XRD, XRF and particle size analysis.