HOLLOW ROUND CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, ID: 0.40mm, OD: 0.55mm, Tolerances +/- 10%, Both ends open. Supplied in screw cap vials - Each vial contains 75 capillaries. Available in 100mm, 300mm and 600mm lengths. Part numbers CV4055-100, CV4055-300, CV4055-600.