SHDIATOOL Diamond Drill Bits 1-3/8-Inch,Core Bits with Round Shank Hole Saw Cutter for Porcelain Tile Marble Ceramic Granite,Dry Wetting Drilling 35mm (Pack of 2) - SHANGHAI DIATOOL CO., LTD., A85923510x2T

• Package Includes: 2pcs 1-3/8"/35mm dry diamond drill bits,Total Length 65mm,Diamond height 10mm,Diamond Grit #40/50,Round Shank,Locked in hand drill tightly Application:Diamond core bits are worked great for dry drilling holes through hard porcelain tile, ceramics,bathroom tile,granite & marble, masonry, concrete, glass, hard plastic with ease Durable & Efficient:dry drilling. Water can act as additional cooling to prolong the worklife of bit. Machine:They can be used with hand drills, bench drill etc,can be used with common drilling machines and cordless screwdrivers from many well-known brands Vacuum brazed:Vacuum brazing is the most effective and precise way of making diamond tools. It makes the industrial diamond grains permanently brazed to the edge of steel core, creating an unbreakable and extremely heat resistant segments