This 1 mm I.D. x 2 cm guard column is ideal for microbore chromatography. The total volume of .15 µl insures maximum column efficiency and column protection. The column can easily be dry-packed using the specially designed funnel. A 3 gram bottle of packing material will pack this column over 120 times. Each kit contains two guard columns, a package of 100 .5 µ frits and a packing funnel.