Shell Vials - American Chromatography Supplies Broad selection of 8mm crimp top and snap top MicroVials. These are available with flat bottom, round bottom or conical bottom, in clear or amber glass and Chat Now GC Autosampler Vials No. 12 x 32 mm, 6.0 mm Opening. Vials. 2.0 mL, Clear glass, 0.35 mL Glass insert, shell style, 6 x 31 mm