HOLLOW SQUARE CAPILLARIES MANUFACTURED IN BOROSILICATE GLASS, Square ID: 1.00 x 1.00mm, Wall thickness 0.20mm +/-20%, ID Tolerances +/- 10%, Supplied in plastic vials - Each vial contains 25 capillaries. Available in 50mm, 100mm, 300mm and 600mm lengths. Part numbers 8100-050 (8100-50), 8100-100, 8100-300, 8100-600, ST8100.