Descripton:<br> 50pcs\/set Diamond Coated Grinding Head Grinding Bur for Rotary Tools<br>  <br> Specification:<br>   Suitable for use in grind the edge of glass， tile， marble， jewelry or rock.   Please add water for coolant when using diamond bits.   There are many shapes， such as sphere， cylinder， round head cylinder， needle， flat plate， etc.   Come with the box as shown on picture.   Shank Diameter: Approx. 3.1mm (Close to 1\/8&amp;quot;).   Largest head size: Approx. 16mm (Close to 5\/8&amp;quot;).   Smallest head size: Approx. 1mm (Close to 1\/25&amp;quot;).   Diamond sands: Grit 80.<br>  <br> Package included:<br> 1 x Set (50pcs) Diamond Coated Grinding Head<br>  <br> More Details: