HOLLOW ROUND CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, ID: 0.30mm, OD: 0.40mm, Tolerances +/- 10%, Both ends open. Supplied in screw cap vials - Each vial contains 75 capillaries. Available in 100mm, 300mm and 600mm lengths. Part numbers CV3040-100, CV3040-300, CV3040-600.