8mm glass shell vials with caps for minerals-Aijiren Hplc. Cap finish is 15 mm Shell vials are designed for use with autosamplers that require 15 x 45 mm vials. Vials are are available in clear glass or natural polypropylene. 1234Q06 has a limited volume of 3 mL with other vials having a capacity of 4 mL. Caps Snap.