Keep your trimming tips sharp with a few passes of this 600-grit diamond file. Diamond cuts hard materials like tungsten carbide, and 600 grit is fine enough for quick touch-ups that bring back a smooth, sharp edge. One side is curved for rounded edges and the other is flat for straight ones, and the tapered point reaches smaller tips. It'
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I haven’t used this yet, it was a “just in case” purchase for a 7 and double ended tool.