【Package Contents】 This set includes 2pcs of 1/2In (12mm) dry diamond core drill bits. Total height 65MM, Max working depth 30mm, Diamond height 8MM. 【Widely Compatibility】 This diamond drill is designed in round shank, which is compatible with most machines, such as hand drill, angle grinder, bench drill, also can be matched with side flutes help to remove debris and drill holes smooth and fast. 【Vacuum Brazing Technology】Processed by vacuum brazing technology, which garantees long service life and cost-value; High-quality diamond particles contribute to high efficiency and faster drilling speed. 【Wax Inserted】Each dry diamond bit is embedded with wax that will melt during dry drilling to cool the cutting surface; Water can act as additional cooling to prolong the worklife of bit. 【Multiple Application】Dry drilling for Granite, Tile, Ceramic, Marble, Stone, Glass, Porcelain, Masonry, etc. Dry Diamond Drill Bit Set 2pcs pack 1/2 Inch (12mm) Diamond Hole Saw Core Drill Bit with Round Shank for Porcelain Tile Ceramic Stone Granite Marble Dry Drilling