I doubt I will buy them again. This is in no way Kobalt M42. I've tried this on both of my drill presses. Same speed, same length, same mission type. I had to drill 4 holes on 8 panels. Both beats chirp terribly. Especially the ones on the craft press. I even swapped them out to test the attachment but it still didn't chirp well and didn't want to cut at all. The only reason I ordered them was because I was in a hurry to finish a client's work and it was the fastest shipping option. One of the drills made thin cuts in 1/2 of the metal plates, which took forever. The other part on the Ridgegate started cutting well after the second record, but it still bounced and chirped like hell, even with a ton of coolant. I also don't like that I bought Drill America and they send 'Qualtech' if it wasn't because I was in a hurry I would send them back. I have already bought another drill from a different brand that has always done a good job drilling holes, "Drill Hog M42 Cobalt" as you can see in the pictures, about half of the drill has lost its gold . None of my other M42 cobalt drills have ever done this. I'm wondering if they are made of cobalt or just plated on top like cheap gold plates.