Screw Top Vials, Caps and Kits | Aijiren Tech Scientific. Our screw top clear and amber glass vials and plastic screw top vials are available in 8mm, 9mm, 10mm, and 13mm screw threads. The most commonly used vials are 9mm, 12x32mm screw thread vials. A 12x32mm vial is also known as 1.5mL, 1.8mL, and 2.0mL vials by different manufacturers.