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10 Pack Diamond Drill Bit Set, 6mm (1/4inch) Small Diamond Hole Saw Kit for Glass, Ceramics, Porcelain, Ceramic Tile, Marble : Amazon.co.uk: DIY & Tools
Dry Diamond Drill Bits Set 10 PCs 1/4" 6mm Small Diamond Hole Saw Kit for Granite Marble Porcelain Tile Ceramic Stone Glass Hard Materials (not for Wood) Round Shank - Amazon.com
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Diamond Drill Bit, Diamond Drill Bits for Concrete Marble Stone Ceramic 6mm : Amazon.co.uk: DIY & Tools
5 PCS (6mm, 6mm, 8mm, 10mm, 12mm) Professional Hex Shank Extension Spiral Glass Tile Drill Bit Set - China Drill Bit Set, Glassdrill Bit | Made-in- China.com