This Power Tools Core Drill Bit Diamond Brazed Hole Saw Kit Tile Drilling Diamond Core Drill Bit Set contains 10 M14 22mm Diamond Core Drill Bits, perfect for drilling ceramic tile, porcelain tile, marble, granite, stone and more. The diamond brazed tip ensures a long lifetime and fast drilling. The set comes in a handy storage case for easy storage and transportation. With this set of diamond core drill bits, you'll be able to quickly and easily drill holes in any kind of hard material.