HOLLOW RECTANGULAR CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, ID: 0.04mm x 0.40mm, Wall thickness 0.028mm, Tolerances +/- 10%, Open both ends. Supplied in screw cap vials - Each vial contains 36 capillaries. Available in 50mm, 100mm, 300mm and 600mm lengths. Part numbers 5004-050 (5004-50), 5004-100, 5004-300, 5004-600, RT5004.