The 20 inch diamond disk in 60 grit is a rough grit diamond used for first step grinding and shaping on most larger surface areas of glass. For smaller surfaces it can be followed by a fine grit diamond. For larger surfaces it should be followed by a medium grit diamond, and then a fine grit diamond before moving to resin for pre-polish. Disks are magnet backed for easy application and removal on lap grinder metal wheel heads.
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