test tube rack, specification as:
13mm/50holes,50pcs/carton,56*23*24
15mm/50holes,50pcs/carton,52*28*25
18mm/40holes,50pcs/carton,52*28*25
16mm/50holes,80pcs/carton,54*28*53
18mm/50holes,80pcs/carton,54*31*60
13mm,50pcs/carton,56*27*45
16mm,50pcs/carton,54*25*57