LCGC Certified Clear Glass 12 x 32 mm Screw Neck Vial with Cap and Preslit PTFE/Silicone Septum, 2 mL Volume, 100/pk. When you shop for lab equipment that vials meet the most stringent requirements for dimensional tolerances, UV cleanliness, and MS cleanliness based on LC/GC standards choose LCGC Certified Clear Glass 12 x 32 mm Screw Neck