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DT-DIATOOL Dry Diamond Drill Core Bits Set 4PCS 6/8/10/12mm Quick-fit Hex Shank Vacuum Brazed Hole Saw for Tile Porcelain Ceramic Marble Granite Vacuum brazed Hex Shank Quick-Change dry diamond drilling core bits set Quantity: 4 pieces; Diameter: 6/8/10/12mm; Diamond length: 10mm; 6mm: Total length: 68mm; 8 - 12mm: Total length: 80mm; Hexagon Shank; Maximum drilling depth: 30mm Wax inside... DT-DIATOOL Dry Diamond Drill Core Bits Set 4PCS 6/8/10/12mm Quick-fit Hex Shank Vacuum Brazed Hole Saw for Tile Porcelain Ceramic Marble Granite