Review on Mgtgbao 50Mm Black Diamond Beveling Chamfer Bit, 2" Diamond Countersink Drill Bits With 5/8-11 Inch Thread For Enlarging, Polishing And Bevelling Granite Marble Tiles The Exsit Holes Enlarging by Carta Gutierrez

I used this bevel chamfer bit mounted on a Bosch 11,000 rpm right angle grinder. It worked very well for its intended purpose - to grind away excess tile edge material and enlarge holes. The glazed surface edges of the tile, however, did experience minor chipping (see photo). Inspection of the grinding mill diamond surface showed the diamond particles stayed firmly attached after use. I would expect with continued use the "high particles” will probably smooth out somewhat and further reduce tile edge chipping, but don’t know how long that might take. It is a fairly coarse diamond matrix - which is needed for efficient grinding. In operation the tool was easy to control. I was able to precisely cut away only the material I wanted removed. The mill removed material efficiently.