A _____ abrasive is used for finish filing, refining, and buffing.

• A. Fine-grit
• B. Coarse-grit
• C. Medium-grit
• D. Ultra-grit

Answer: (A)

Fine-grit abrasive is used for finish filing, refining, and buffing because finishing tasks aim to smooth the surface without removing much material. Grit size shows how aggressively an abrasive cuts: coarse grains remove material quickly but leave noticeable scratches; medium is in-between; fine and ultra-fine grains are intended to refine and polish. For these final steps, you want gentle action that smooths micro-scratches and produces a uniform, ready-for-polish surface. A fine-grit abrasive provides that refined finish without creating deep scratches, which is why it’s the best choice. Coarse grits would gouge the surface, and medium grits wouldn’t achieve the same level of smoothness.