HOLLOW RECTANGULAR CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, ID: 0.04mm x 0.40mm, Wall thickness 0.028mm +/-20%, ID Tolerances +/- 10%, Both ends open. Supplied in plastic vials - Each vial contains 25 capillaries. Available in 50mm, 100mm, 300mm and 600mm lengths. Part numbers 5004-050 (5004-50), 5004-100, 5004-300, 5004-600, RT5004.