Printed with Label and Filling Lines, these 8mm screw neck vials are made with tightest dimensional tolerances to match leading brands like Agilent, Waters, Thermo Fisher etc. Chemically inert screw caps are made from virgin grade polypropylene and are suitable for most chromatography applications. Supplied as combo-pack with 8mm Black PP Screw Cap with hole and Red PTFE + White Silicon Septa.