Tools 5 Lathe Mill Center Drill Countersink Bit Tooling Set, M35 HSS 5% Cobalit Contained, Titanium Plated (CPM)

It was time to finally buy another set after 2 years. I used them on stainless, aluminum, steel. They were definitely abused. They were slightly dull after time, but always cut without overheating and ruining them.High speed steel were a bit of a let down, and these outperformed without being far too brittle like carbide. I broke three tips on the original set in two years. The teeny tiny guys, broke those because of their size, and one 8mm tip a month ago. But that’s a pretty good track record IMO.

Good

They are not as sharp as my other Center Drills so they cut somewhat slower and require greater pressure to effectively drill pilot holes. Nevertheless, I will use them and buy elsewhere next time.

I'd never thought it will come with good package but it did .cause the monery of this is really worth the money and they are really good company and running a good product in low price .

They are cheap but not sure who may be out of business because of that. because that's what happens. These are good for a beginner that may be learning but when you need reliability you cannot find it anymore because it was driven out of business by all the beginners "learning"

Not for use with a hand drill. I would only use these in a mill or lathe where the bit and workpiece don’t wiggle around. Use them in a hand drill and they WILL BREAK! Will buy again when worn out.

They worked great. I typically only machine aluminum, so they are probably not seeing the most severe duty, but they are working fine with no breakage.

As a home hobbyist, it does the job what I needed it to do. For the value of the money it does well, but be careful of the smaller bit it needs to be lubed to prevent dulling.