*Grades 800 MX and 1200 MX are made with aluminum oxide crystals. This material is available in the following 13 grades, from coarse, to fine: 60 MX, 80 MX,100 MX,120 MX, 150 MX, 180 MX, 240 MX, 320 MX, 360 MX, 400 MX, 600 MX, 800 MX*, and …
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