You may see a code on grinding discs, such as A24R on a DW4523. First letter = abrasive material A= Aluminum Oxide (usually metal) S- Silicone Carbine (usually masonry) C- Ceramic D- Diamond B- Cubic Boron Nitride Z- Zirconium (metals) Second digit(s) (number)- Grain size. Similar to sand paper grades, the lower the number, the coarser; the higher the number, the finer. Goes from 8 to 1200. Next Letter - Wheel grade- A (soft) to Z (hard) For instance- A24R means ? Aluminum Oxide, 24 grit, about mid hardness.
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