The Clear Glass 12 x 32 mm Screw Neck Max Recovery Vial is manufactured in Waters’ cGMP, ISO 9001 certified plant under the strict conditions and tightly controlled settings. As with all lines of Waters vials, the Clear Glass 12 x 32 mm Screw Neck Max Recovery Vial uses a strict adherence for dimensional tolerances for height, width, neck opening, neck center, threads, and bottom thickness specified for autosamplers.