Auspex Scientific - The Exciting Science and Educational Store
Twist one of the three rubber protrusions off and the solid stopper becomes a one-hole stopper. Twist another one off and you have a two-hole stopper, or twist the third one off for a 3-hole stopper.
Made of "white" natural rubber, with safe, convenient, countersunk 5 mm hole.
Top diameter 36 mm
Bottom diameter 30 mm
Height 23 mm
5 stoppers per pack.
SORRY, OUT OF STOCK !!!!!!!!!!!