Microsolv Headspace Crimp Cap gold, aluminium, magnetic, 5 mm center hole, with natural Sil/Foil (125mil) Septa, for 20mm Crimp Top Headspace Vials,

Caps, Headspace, Crimp Top, with Natural Silicone Rubber / Foil (125mil), High Purity Septa, fitted in Steel, Magnetic, Gold Caps with 5mm center holes. For use with 20mm Crimp Top Headspace Vials. BASIK Brand