Review on Tulead Center Drill Countersink Lathe by John Ghattamaraju

I've been using countersinks for years, but whoever hardened them. They aren't very sharp at the ends either, so I think they break due to the high pressure it takes to get them working. They appear to be fairly accurate, but break easily. I don't recommend them if you're making stainless steel or steels. They may be suitable for materials related to aluminum or bronze.