McKesson Capillary Blood Collection Tube Plain 75 µL Without Closure Glass Tube (1082111_BX) 1000/BXMicro hematocrit type, 75 L, clear, glass, capillary blood collection tubes without closure. Dimensions: 1. 1 x 75 millimeters. Plain (untreated) tube for use when collecting anti coagulated blood from a blood collection tube. Blue stripe differentiates untreated tubes from heparinized tubes. Designed for both safe blood collection as well as accurate micro hematocrit determinations. Precision molded soda lime glass provides excellent sample retention