or
Tubes, Centrifuge; Glass; Pyrex; Conical bottom; Capacity: 50mL; Closure: none; Graduations: None; With marking spot; Beaded Rim; O.D. x L: 28 x 135mm
Tubes, Centrifuge; Glass; Pyrex; Conical bottom; Capacity: 50mL; 28 O.D. x 176mm L; No. 16 ST Pennyhead stopper; Graduated with white enamel markings