Standard 2 mL screw top vial-cap kits; including SureStop vials with AVCS caps, 4, 8, 12, 16, 20, or 40 mL vial-cap kits, 20 mL screw top vials with 24 mm caps. 2 mL Screw Top Vials & Screw Caps - Aijiren. The 2 mL screw top vial is recommended for sample matrix that is not too volatile. Our short thread design of our 9 mm screw cap makes for a quicker application Vials and Closures Catalog 2014-2015 - Thermo Fisher Scientific. open top cap built-in, the integral membrane closure provides a