Extended threaded interface is more convenient and Extended hole opening function with built-in cooling wax can directly dry open the hole Suitable for processes that require hole opening and then expansion. Diamond Chamfer Bits Center Drill Bit Scope of application: Ceramic tiles, marble, quartz stone, Applicable model: M10 Angle Grinder 100 TYPE Function: Suitable for expanding holes, chamfering, and polishing marble, quartz stone, ceramic tiles, etc Features: Sharp grinding, wear-resistant and , environmentally friendly, and long service life Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Connection: M10 Thread Grit: #50 Total Length:about 55mm Colour:yellow Material:Emery Package Contents: 1 x drill tiles Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.