23 x 75 mm 20 ml Headspace Autosampler Vial Kits Beveled crimp seal finish for tighter septa seal Steel magnetic crimp caps available for LEAP/CTC Lot to lot quality assurance with lot number coding Proven performance on all major headspace instruments Type 1 borosilicate glass PTFE/ Silicone or PTFE/ Molded butyl rubber septa Caps have 8mm