Specially suitable for VWR (Merck®)/Hitachi instruments 0.2ml. Micro-Insert,. 31 x 6mm, clear glass,. 1st hydrol. class, flat bottom. Your Partner for reliable closure technique in - Chromoptic. Sep 15, 2016 Micro-Inserts for Crimp Neck Vials ND11 with wide opening La-Pha-Pack are the only supplier of chromatography vials from class 10,000 ...