Microsolv Headspace Screw Cap blue, steel, magnetic, 8mm center hole, white Sil/blue PTFE Septa, for 18mm Precision Thread Headspace Vials, 1000 pc/

Caps, Headspace, Screw Top, with White Silicone Rubber / Blue PTFE Septa, fitted in Steel, Magnetic, Silver Caps with 8mm center holes. For use with 18mm Precision Thread Headspace Vials. BASIK Brand. 1000/CS.