YUFUTOL SA-5 Tungsten Carbide Burr Cylinder Shape Double Cut Rotary Burr File(1/2” cutter Dia X 1”Cutter Length) with 1/4'' Shank dia,Pack of 1

This burr grinder worked great.

Es muy resistente

I bought this carbide bit to shape a hole I had cut I a large zirconium crucible that I was going to use as a burn pot in my propane powered forge. I didn't realize how tough this material is. I destroyed two carbide bits to drill a pilot hole in the 3/4" wall of the crucible. I then used a dozen carbide rod saws to cut the two and a half inch hole in the side. I then used this bit to shape the opening into the burn chamber so the flame would enter at an angle to the inner crucible to create a vortex flame path. This bit withstood the three or four hours of grinding to make the opening work. I have never worked with such a hard substance and this buit held up enough to get the job done.

Works wonderful,

Only used it once (on stainless steel) and worked like a charm! Too early to comment on durability/value.