Could not use it, was not the diameter of a wine bottle. Not the company's fault. I just did not know the OD was in CM. The inside diameter was correct at 3/8 inch. Odd that the inner diameter of the hole bored in the cork was in inches, and outside diameter was in centimetres. They are far too large to fit into a standard wine bottle, so I just threw my money in the trash. I did write to the company to ask if I can send them back (my fault), and waiting for a response..