That’s a Twisted Knot Wire Cup Brush for angle grinders
What it’s used for:
Heavy-duty surface prep and cleaning. The twisted steel wires are super aggressive, so it chews through tough stuff fast.
Main jobs:
1. Rust removal - strips rust/oxidation off steel, iron, pipes
2. Paint/coating removal - takes off old paint, scale, weld slag, concrete splatter
3. Weld cleaning - cleans welds before inspection/painting
4. Surface prep - roughens metal for better paint adhesion