3M Paint and Rust Stripper 7771NA 10 Brush Mandrels Hardware Department, Open Stock. Cleans rusty surfaces with a double-thick edge to strip quicker. Features Scotch-Brite abrasive web that won't rust or splinter like wire brushes. Conforms to surface contours, reduces gouging and leaves a smooth paintable surface. Fits all standard household drills: 1/4-Inch, 3/8-Inch and 1/2-Inch. Use as a rotary disc (on face) or as a brush (on edge).