Caps, Screw Top, with Beige Silicone Rubber / White PTFE ultra-pure Septa, fitted in "knurled", polypropylene, Blue Caps with 6mm holes. For use with 9-425 thread, 12x32mm autosampler vials. MicroSolv Brand. 100/PK.
Larger, 6mm hole in the cap provides a larger target area for autosamplers that might have difficulty and may strike the cap edge of smaller hole caps, during injection.