The Jende 300 Diamond Stone is a coarse diamond plate used for minor profiling

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steel concentric groove lapping plate new-variants The Jende 300 Diamond StoneThe Venev Concentric Groove Steel Lapping Plate is the perfect tool for flattening and lapping synthetic and natural stones with silicon carbide powders and diamond compounds. The plate has two concentric groove lapping surfaces and diameter of 200 mm. Steel: 30HGSA Hardness: 45 50 HRC Diameter: 7. 8 inches (200 mm) Highness: 0. 4 inches (10 mm) Weight: 4. 4 lbs. (2. 8 kg) How to use: Add some clean or soapy water on the plate to make a suspension