20mm Vial Stopper, Nubbed 2-Leg Lyophilization, Pack of 100

This "nubbed style" has been temporarily replaced by and alternate 20mm 2-Leg Lyophilization Vial Stopper

20mm Vial Stopper, Nubbed 2-Leg Lyophilization, Pack of 100
These stoppers require appropriate washing, rinsing, and sterilization, whenever applicable, to meet industry specific requirements. 
20mm vial stoppers are for serum vials with a 13mm hole opening and 20mm outside rim-to-rim outer diameter.