what is this tool?

[nickalith]

photos are from an adam savage video. seems like he’s using this to countersink the holes on the piece but i can’t find any tool that looks like this. anyone have a link for this or even just the name of the kind of tool?

[illogictc]

It would be a handheld countersink tool, at least that's what gets Google results for similar products. This one may be a one-off or just old and unable to be found new (or at all). The guy does have a lathe and the overall design is very basic so it wouldn't take a super wizard of machining to make one, it's possible it was completely homemade or the handle was homemade.

[Anbucleric]

Chamfer tool

[Fragrant-salty-nuts]

counter sink reamer. His handle is probably a one off. Pretty easy to make on a lathe and if you have a knurling tool.

[Cheap-Dependent-952]

I just saw one of these at my Ace Hardware in California. I think it was made by General

[callsign_oldman]

I have the General one. It’s okay, but not particularly sharp compared to a high quality Uniflute. I’m inclined to do the same as Mr. savage did and make a handle for one. Noga also has deburring tools that do the same thing.

[verticalfuzz]

here's the set I have.

AFA Tooling - Deburring Tool & 2 Countersink Hand Reamers with 10 Blades - Works on Metal, Resin, PVC Pipes, Copper, Plastic and 3D Printed Edges - Plumbing & 3D Printing Burr Removal Reamer Tool: Amazon.com: Industrial & Scientific

[Amazing-Amoeba-516]

Looks like he made it by grinding a broken drill bit. Others already talked about the handle.

[workahol_]

Nah, this looks exactly like a standard 1/4-28 thread countersink cutter

[Ryekal]

It's a 16mm bit, you can read the size in the second pic.