Inserts for 2mL Vials. Headspace Glass. Crimp 6, 10, 20 mL / 20mm Crimp Caps (Magnetic Tinplate and Aluminum) Vial/Cap. Septa Kits. HPLC &GC Certified Screw Vial / Cap Kits: 2 mL screw /9mm caps (includes SureSTOPTM vials/ AVCSTM caps) MS Certified Screw Vial/ Cap Kits: 2 mL screw /9mm caps (includes SureSTOPTM vials/ AVCSTM caps)