NSK Kogyo
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Watch the video below to see how important this tool is when working with coarse NSK Kogyo stones.
This stone is a #120 grit SiC-based lapping stone, which is best suited for 200 grit diamonds but also works with 400 grit Oboro Knife diamonds.
Grit: #120
Long: 130 mm
Wide: 50 mm
Thick: 25 mm