5pcs Counterbore Drill Bits Set, 4 Flutes Straight End Mill Cutter HSS Countersink Slot End Mill Cutter M3-M8 for Copper Aluminum Cast Iron

I was a tool and gage maker for most of my life, these tools are well made and fine quality.

The seller shipped this very fast and even emailed me a few days later to make sure that I received the item and if I was satisfied with the product. I highly recommend this product and seller!

Great product, decreases time spent on job and good price.

Works great for SHCS counter bores. I can now quickly waterjet out plate (inc the right size pilot hole) then run these in the drill press and never fire up the CNC mill.

I won’t use these bits a lot but when you need to counter bore a hole in aluminum or wood they do the job without having to spend alot.

As described, excellent product, worked perfect ! Great packaging.

These are a good set of counterbores for the money. I would only use them in softer materials and save the expensive carbide tooling for harder materials. But in aluminum, these do pretty well. I would use these in wood or plastic too. Not sure how well they would stand up to cast iron, but I wouldn't try it personally, they would probably last a job or two and be shot.For the price and how well they work on softer materials, go ahead and get some!

I use these all the time making scales for pocket knives. I've only used them on plastic so these should last forever.