​Total Length：70mm ​ ​Features: ​ ​1. Vacuum Brazed Processing, high diamond concentration provides for a faster cut rate while the high quality of the diamonds provides longer working life ​ ​2. The step and chamfer design can expand holes, grind and chamfer stones, and is an essential tool for installers. ​ ​3. Very useful to reduce the risk of cracking with standard and large format tiles subjected to tension (ex tightened plumbing, led lights etc). ​ ​4. Very useful to improve the edge finishing of exposed holes. ​ ​5. Dry or wet use.