Auspex Scientific - The Exciting Science and Educational Store
Twist one of the rubber protrusions off and the solid stopper becomes a one-hole stopper. Twist the other one off, and you have a two-hole stopper.
Made of soft, "white" natural rubber, with safe, convenient, countersunk, 5 mm holes.
Top diameter 26 mm
Bottom diameter 20 mm
Height 25 mm
5 stoppers per pack.
NOTE: Only 1 order left in stock !!!