Honestly, not sure what this is and who it is made by but I used the google search for further help Uni Flute Countersink Bit is a high-quality tool designed for creating precise countersinks in various metalworking projects. With a sleek design and accurate flute drill hole, this countersink bit ensures smooth and efficient drilling. The durable construction and reliable performance make it a valuable addition to any CNC, metalworking, or manufacturing setup.

I included the picture of the Google search

I did notice that these are not cheap I am writing used but not even sure it was

If you know anything about this please share your knowledge with me

Thank you!

Bin 15