Auspex Scientific - The Exciting Science and Educational Store
This is for 2 pieces of the Number 10 size stoppers!
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. Twist the remaining one off and it becomes a 3-hole stopper.
Made of "white" natural rubber, with safe, convenient, countersunk 5 mm holes.
Top diameter 50 mm
Bottom diameter 43 mm
Height 23 mm