The LVI Vials are 12 x 32 mm large opening vials with a sealed-in, limited volume insert. The insert incorporates a slight flare at the top, providing a greater needle target area, which prevents needle damage. WHEATON LVI Chromatography Vial with Fused Insert The LVI Vials are 12 x 32 mm large opening vials with a sealed-in, limited volume insert.