Feature●Help reduce samples to analytical powders for XRF and ICP●Use with vial holder 04575-32●Includes one 5/16" (7.9 mm) tungsten carbide grinding ball●1 year warranty●Ideal for pulverizing the toughest rocks, mineral, cement, and ceramicsDescription Each vial measures 2-1/8"L x 3/4" dia. Grinding load is 0.5 to 1.5 g.