Thermo Scientific Snap-It Cap Clear PE with 6mm Hole and White PTFE Septum for 11mm Autosampler Vials 1000/Case. Chemical resistant PTFE is 0.010" (0.25mm) thick and easily penetrated by syringe needles. For one time use only and are not resealable. Eliminate the need for crimping or de-capping tools. Suitable for most chromatography applications and are an economical choice for routine HPLC GC and IC applications. Case of 1000 Pack of 100 Thermo Scientific Snap-It Cap Clear PE with 6mm Hole and White PTFE Septum for 11mm Autosampler Vials 1000/Case