网页SPEX SamplePrep. all SPEX SamplePrep plastic vials 3/4 in. ( 1.9 cm) and larger. Stainless Steel Vial Set: For wet or dry grinding/mixing. Vial size 21/4 in. (5.7 cm) diameter x 3 in. (7.62 cm) long. Vial body and cap liner made of hardened 440C stainless steel. Set includes screw-on cap with O-ring, two 1/2.