Review on 🪚 Metal JNBPRO Countersink Drill Bit by Tone Hatton

HSS doesn't inspire me much confidence, although it's a cobalt mix I have to admit I've looked at the top sellers in this category and they all have very rough edges on them. When countersinking metal holes, I assume manufacturers understand why they create a smooth glass cut when it's only going to be covered with a cone head screw anyway. Update: This is actually because the explosion photo exaggerates the drag marks. They are relatively smooth to the naked eye. In the milling world, HSS bits are inexpensive and don't stay sharp for as long as carbide bits. However, they will come in handy. I can't tell you how many times I've just tried using a much larger bit to bevel the edge of a freshly drilled hole. It's really an imperfect way to do it. This is tolerable if you have a good drill and can steady the drill. So they fulfill a function.