FPPO 5pcs Brass Wire Wheel Brush Kit for Drill,Crimped Cup Brush with 1/4-Inch Shank ,0.13mm True Brass Wire,Soft Enough to Cleaning or Deburring with Less Scrach

I used these:brass brush attachments for power drill It doesn’t matter which size because the heat from torching the hardware makes the bristles melt brass into the hardware when it passes over, effectively making the bristles melt away during use. What matters is that the bristles are 100% brass, not brass coated. This short video shows the process very simply https://youtu.be/PhFDJUS7Ddw?si=VU2YnMviWQhEST7c