HOLLOW SQUARE CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, Square ID: 0.50 x 0.50mm, Wall thickness 0.100mm +/-20%, ID Tolerances +/- 10%, Supplied in plastic vials - Each vial contains 25 capillaries. Available in 50mm, 100mm, 300mm and 600mm lengths. Part numbers 8250-050 (8250-50), 8250-100, 8250-300, 8250-600, ST8250.