Autosampler Vials Aijiren found in: Autosampler Vials, Large Opening R.A.M. , Screw Top Vials, Clear R.A.M. Vial with Ribbed Screw Thread Cap, 6 mL Screw.. Clear glass vials with 20mm crimp seal finish are designed to fit most headspace autosamplers Flat bottom vials maximize heating efficiency when used with bottom Round bottom vials are more easily handled by robotic arms that lift the vial