3M and Rust Stripper 7771NA 10 Brush Mandrels Hardware Department, Open Stock. Cleans out of practice with a double-thick edge to strip quicker. Scotch-Brite disagreeable web that wo n't rust or splinter like wire brushes. Conforms to surface contours, gouging and leaves a unnotched paintable surface. all normative household drills : 1/4-Inch, 3/8-Inch and 1/2-Inch. as a circle disc -LRB- on face -RRB- or as a brush -LRB- on edge -RRB-.