I haven't used all of them because there are so many. I started with a 1/8" flat end and it's a beast. It's been through a lot and it's been great. I then used a 1/8" 2mm ball end. 2 of them broke during the same test cut. They seem very brittle. Finally I used a 2mm gold colored rotary cutter. Like the 3mm flat drill it seems solid, I don't know if I accidentally got 2 bad round ends in a row but I'm worried about the rest.
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