1PC 6-100mm M14 Sintering Core Bit Diamond Hole Saw Marble Granite Brick Tile Ceramic Concrete Crown Drill Bits For Power Tools Diamond Drill Bits: 6-100mm cutting diameter. Sintered diamond cutting edge contains diamond particles from inside to outside, to ensure that the edge is always sharp. Application: Can be dry or wet drilling. To prolong the using life, it is recommended to be used with water for cooling and lubrication. Drill accurate holes on concrete, masonry, hard brick, marble, stone, marble, glass, tile and other hard materials. Fit for Angle Grinder: Easily operate on the M14 Angle Grinder. Or need an adapter for drill or other machine, such as hex, round shank etc. . Cannot be used on impact power tools. Features: Large clearance hole facilitates the entrance of cooling water and the escape of chips and other particles from drilling. Makes drilling process much easier. Notices: When cutting holes, it needs to be positioned at an angle of 45 degree and make a crescent-shaped trace on the material. Then cut holes vertically and need to be cooled with water.