All Headspace Vials and Caps pass stringent QC tests for form, fit, and function. They have become the standard for virtually all instrument OEMs due to the quality of the entire product line. Volume: 6ml, 10ml, 20ml Dimension: 22*38mm, 22.5*46mm, 22.5*75mm Color: Amber and Clear Neck: Crimp Neck Diameter: 20mm