HOLLOW RECTANGULAR CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, ID: 0.40mm x 8.00mm, Wall thickness 0.40mm +/-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 2548-050 (2548-50), 2548-100, 2548-300, 2548-600. NOTE: Previous part numbers were W2540-050 (W2540-50), W2540-100, W2540-300, W2540-600, RT2548.