... and color. Suitable for making tools for various stones, fine glass, ceramic and magnetic materials, etc.MGD80:Consist of ... electroplated tools to grind and polish stones, ceramic, glass and magnetic materials, etc.MGD50:Medium strength, contain comparative ... load materials, like cemented carbide, ceramics, magnetic materials, glass, etc.MGD40, MGD30:Slightly friable abrasives. Suitalbe for economic ...