- Please fix the quantity error in (MQC212) Quartz Capillary Tubes (Round), O.D.: 1.9mm, I.D.: 1.65mm, Length: 50mm, (MQC373) Quartz Capillary Tubes (Square), Outer Dim.: 1.8×1.8mm, Inner Dim.: 0.25×0.25mm, Length: 25mm, (MQC368) Quartz Capillary Tubes (Square), Outer Dim.: 0.9×0.9mm, Inner Dim.: 0.7×0.7mm, Length: 50mm products