HOLLOW SQUARE CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, Square ID: 0.20 x 0.20mm, Wall thickness 0.100mm, Tolerances +/- 10%, Supplied in screw cap vials - Each vial contains 30 capillaries. Available in 50mm, 100mm, 300mm and 600mm lengths. Part numbers 8320-050 (8320-50), 8320-100, 8320-300, 8320-600, ST8320.