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Precision 5 mm diameter NMR tubes are made from quality Pyrex borosilicate glass for compatibility with ground joints, valves, and vacuum racks. Made using precision bore tubing manufacturing techniques proven most reliable in NMR applications. A complete selection of tubes for all types of NMR spectrometers, from 60 to 600 MHz is available. All 5 mm NMR sample tubes have O.D. = 4.97 + 0.000-0.013 mm. The I.D. of all except basic tubes are 4.20 + 0.013-0.000mm.