Snap ring/crimp neck N 11–Vials and caps–MACHEREY-NAGEL . Snap ring/crimp neck vial, N 11, 11.6x32.0 mm, 0.7 mL,round bottom insert,PP tr. Plastic vials are used in ion chromatography, for heavy metal analysis, for polar (e.g. proteins) or pH-sensitive samples and AAS, CE applications.