Comparison : Item # 4258-01, Volumetric Flask, Wide Mouth, Heavy Duty, without Stopper
Item # 4258-02, Volumetric Flask, Wide Mouth, Heavy Duty, without Stopper
Item # 4258-04, Volumetric Flask, Wide Mouth, Heavy Duty, without Stopper
Item # 4258-06, Volumetric Flask, Wide Mouth, Heavy Duty, without Stopper
Item # 4258-12, Volumetric Flask, Wide Mouth, Heavy Duty, without Stopper