Vial set Spex hardened steel for wet or dry grinding/mixing, vial size 2 1/4 inch (5.7cm) diameter x 3 inch (7.62cm) long, includes screw-on cap with O-ring, two 1/2 inch (12.7mm) and four 1/4 inch (6.35mm) steel balls, volume 65 mL, grinding load 3–10mL, mixing load approximately 25mL