Reddit reviews Cobra Carbide 10623 Micro Grain Solid Carbide Regular Length Burr with Ball End, Single Cut, Shape D SD-5, 1/4" Shank Diameter, 1/2" Head Diameter, 7/16" Cutting Length (Pack of 1)
We found 1 Reddit comments about Cobra Carbide 10623 Micro Grain Solid Carbide Regular Length Burr with Ball End, Single Cut, Shape D SD-5, 1/4" Shank Diameter, 1/2" Head Diameter, 7/16" Cutting Length (Pack of 1). Here are the top ones, ranked by their Reddit score.
Solid carbide tools offer long tool life and faster cutting speeds than other substrates, but are more brittle and must be used with rigid toolholding systemsDesigned for rapid stock removal and excellent surface finishesRound shanks allow use with a wide variety of toolholding systemsSingle-cut style has rows of teeth cut in a single direction for slower material removal and smoother finishesHigh stock removal and excellent surface finish on relatively hard materials
For the bowl, the bit was a single-cut burr. Like this: https://www.amazon.com/dp/B00ECMQUGK/ref=cm_sw_r_em_apa_i_3DFRDbPJCREKT
For the handle, a coarse bit, like this: https://www.amazon.com/dp/B0037MFFQ2/ref=cm_sw_r_em_apa_i_zHFRDbEF4ADCX
Both used on an old in-line, Dremel-style rotary tool. It's a bit more robust than a Dremel, but same idea.
Edit: Ah this is pretty much the tool:
https://www.amazon.com/dp/B01C3WPX6I/ref=cm_sw_r_em_apa_i_ELFRDbCV6QAX4