... > Electro coated; 3> Specially used for dry plate wall grinding before painting; 4> Also fit for derusting, grinding and polishing of metal surface;5 ... of dry wall, plasterboard, etc.before painting;2> Fit for derusting, grinding and polishing of all kinds of metals;3> Widely used ... for grinding of wood, marble, etc.7. Quality Test: 8. Other Sample ...