Yosoo 2PCS Diamond Coated Hole Saw Drill Bits for Ceramic Tile Marble Rock Porcelain This is a brand new item Easy to use, high quality,good performance, long life This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, cer Excellent for making clean and accurate hole on glass , tile and marble Can be used with a standard electric drill( Excluding in this item )