Brass brushes are non-sparking and softer than steel.They will not scratch soft metals like gold, copper, brass.
Specification:
Shank diameter: 3,2 mm
Working diameter: 13,0 mm
Accessory length: 51,0 mm
Maximum RPM: 15.000 1/min
Quantity: 2
Order number: 26150536JA
https://www.youtube.com/watch?v=3C4-1uBrslI