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Length: 100mm;Inner Diameter (ID): 0.3mm;Outer Diameter (OD): 0.5mm Laboratory-grade glass capillary tubes are mainly used for sampling from reaction vessels with small volumes, as well as for TLC plates Note: The fragility of capillary tubes is attributed to their glass composition and extremely small diameter, so please use them with caution Pack of 4000, diameter tolerance: 0.1 mm StonyLab ensures premium products and premium customer service; if received damaged, please contact us immediately; we will solve it until satisfied