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Two slip-on acetal caps with tungsten carbide inserts, six polycarbonate center cylinders, one 5/16" (7.9 mm) tungsten carbide grinding ball, two O-rings for center cylinder, and two flat gaskets for caps.
Each vial measures 2-1/8"L x 3/4" dia. Grinding load is 0.5 to 1.5 g.
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