M10 Diamond Core Bit Hole Saw Drill Bits Cutter for Marble Granite Tile Stone. Process: sintering hot pressing. Features: strong and sharp. Application: Drilling for marble/granite/pebble/microcrystalline stone/tile/red brick etc. When using, it is necessary to add water to cool the whole process, and it is forbidden to drill tempered glass. 2.6-10MM hole opener is for chip removal. 100% Brand New And High Quality. Absolute guarantee of high quality and inexpensive! If you are not satisfied with the item, please contact with us. Any problem, please feel free to contact with us. We care about our valued buyers, if you have any questions, our Customer Service staffs will be very glad to help you. We try our best to reply to your emails as soon as possible, however, due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. About item:For the functional products in our shop, we make sure that the functions are the same as description, but the actual color and shape may looks a little different from pictures because of the technical improvement and manufacturing variance.