Microsolv Screw Cap black, knurled PP, 5.5mm center holewith white Sil/red PTFE Preslit 1.3mm thick Septa, for 8-425mm thread, 12x32mm autosampler

Caps, Screw Top, with 1.3mm thick Silicone Rubber / PTFE Pre-Slit Septa, fitted in knurled, polypropylene, Black Caps with 5.5mm center holes. For use with 8-425mm thread, 12x32mm autosampler vials. BASIK Brand. 1000/CS.