Feature●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●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.The carbide drill cutter Can be positioned,The ideal diamond drill bit set!●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 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●Electroplated diamond saw blades, multi puprose for cutting & grinding granite & marble, natural stone;Description 1set drill bits and 1pc saw blade