VWR Autosampler Vials, Inserts and Closures. Description Cap Color Cap Material Septum Hardness shore Thickness (mm) Cat. No. Pack of Case of 8mm Open Top Cap, 5.5mm hole Black Polypropylene Red PTFE/White Silicone 45 1.30 46610-700 100 1000 VWR® Standard Opening Screw Thread Vial.