The neck finish of the Snap Ring vial allows the use of Chem Snap Caps or standard aluminum seals. The Snap Ring finish eliminates the need for crimping or decapping. Designed to work with robotic arm or other auto samplers. Choose from clear or amber borosilicate. This vial also incorporates the unique Step Vial design that precisely centers a limited volume insert in the vial neck. Available with or without graduated marking spots, and silanized.