We pride ourselves on producing high quality, consistent and price-efficient screw caps to New Zealand and international markets. Vials and caps | Chromatography | MACHEREY-NAGEL. Vials for GC, HPLC, Headspace, IC, TOC and storage dimensions, material (clear / amber glass, plastic), vial type (screw, crimp, snap, etc.) Vials and Closures Catalog 2014-2015 - Fisher Scientific