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These are CUP BURS you can buy them in different sizes.Wow, great result, Stephan. How did you get the round pearls? They look flawless.

They leave a round part inside the wood. So you need to take away the excessive wood around it. But be careful, they want to wandering around on the wood.
There is also another type but that is better to use on metal to give a round end on a brass thread for example. Like the shape of a rivet.
