This fiberglass scratch brush dials like a mechanical pencil allowing you to choose the courseness of the tip. It is used for removing rust or corrosion in hard to reach places. It is excellent for cleaning electrical commutators and cleaning metal for soldering.
Also available
Brass Scratch Brush Item 30401
Steel Scratch Brush Item 30402
Scratch Brush 3 Piece Set 30403

Fiberglass Refill 2 Pieces are available, item 30404 for $2.00