Agient® Polypropylene Screw Caps with Septa. aijiren CrossLab 2mL (11mm) Crimp Top Vials and Closures. aijiren CrossLab 2mL Standard Opening (8mm) Screw Top Vials and Closures. aijiren CrossLab 2mL Wide Opening (9mm) Screw Top Vials and Closures. aijiren CrossLab 4mL (13mm) Screw Top Vials and Closures.