The anchor 2-3/4" knot wire cup brush is perfect for cleaning up dirty metal. These stainless brushes do not rust.
Walter 13W312 3 x 5/8-11 ALLSTEEL™ Knot-Twisted ST Wire Cup Brush –
Abrasive Brushes
Abrasives for Grinding & Cutting – Wheels, Discs & Brushes –
Eastern Industrial Supplies Inc
Weiler Brush 08534 Cable Twist Knot Wire Wheel, 4 in D x 1/4 in W, .02 in Steel, 1/2-3/8 Arbor Hole
Weiler Brush 13266 Cable Twist Knot Wire Wheel, 4 in D x 1/4 in W, .02 in Steel, 5/8 in-11 UNC Nut
Command PRO Multi-Thread Adapter, Fits 5/8 in-11 to M10 x 1.25
Anchor 4 Carbon Steel Wire Knot Wheel Brush, 4S58
3 Pieces 4 Inch Wire Wheel Brush Cup Brush Set, Coarse Crimped
Task T25685 Wire Cup Brush, 2-3/4 in Dia, 5/8-11 in Arbor/Shank