You can find may previous threads regarding this.
I see you are new to the forum so here are a few pointers:
Go to the search area on the forum page (magnifying Glass icon) and enter the search criteria.
I simply entered "Holes in Tube" and got a list.
Here are a couple:
It's a good idea to do a search first and if you can't find what you want then make the new post.
Some posts may point you in a good direction but may be out of date or not quiet what you need but reading them might help you understand the answers to your post.