Vial set Spex round-ended hardened steel for wet or dry grinding/mixing, vial size 2 3/8 inch (6.0cm) diameter x 3 inch (7.62cm) long, hardened steel vial body has grinding chamber with rounded ends for more efficient grinding/mixing, includes screw-on cap, O-ring, two 1/2 inch (12.7mm) and four 1/4 inch (6.35mm) steel balls, volume 35mL, grinding