Microsolv Headspace Crimp Cap red, bimetallic, magnetic, 8mm center hole, with translucent blue Sil/transparent PTFE Septa, for 20mm Crimp Top

Caps, Headspace, Crimp Top, with Transparent Blue Silicone Rubber / Transparent PTFE Septa, fitted in Bimetallic, Magnetic, Red Caps with 8mm center holes. For use with 20mm Crimp Top Headspace Vials. MicroSolv Brand