Rocaris3 Piece 1/4" Hex 12/16/19mm Countersink Bore Set for Wood Metal Quick Change Bit

take out your device and make sure you measure and ackledge about how thick the diameter of this....Becuase, I did not expect them to be this bulky and thick and heavy and large they are.,don't be fooled by the photos, but make sure what you are purchasing and expect something much better drill bits than you can amazin....

Burned up cutting edge first use! Counter sinking rivets in aircraft aluminum.

Does an excellent job with wood, metal and plastic.

I was using it on fiberglass. It was completely flat by the 20th hole.

The media could not be loaded.  These bits have a very specific purpose: they are used to make your holes a bit more tapered on top, allowing the holes to accomodate a screw head. Check out my video for an example of how I use these bits.I've found them to be excellent ..... and they come in a little metal box so they're easy to keep organized.Simple bits that perform well, doing an excellent job.

My first impression of this set was they looked pretty well made. However, using them I found out they we're pretty cheaply made. For the price I paid though they do their job, but seemed to be dull right out of the box. I don't have to use them very much so they do work okay for here and there use. I wouldn't recommend using them in metal, and they only seem to work decently in soft pine. They do what they're supposed to, but not very well.

This was suppose to have a metal box to keep them in . That’s the reason I bought this one. But when I received the package there was no box. So if you need the box for storage of them I wouldn’t purchase these

Arrived looking rough, not oiled, grind marks very pronounced, the paint looked kind of randomly placed but they work okay.