When does the drill need replacing?

A Benex drill can be used over thirty times. 
In order to protect the drill, do not exert much pressure when drilling and move the drill inwards and outwards to ensure the water cooling.

A Benex drill needs replacing if:

  • the grinding capacity is poor.
  • the diamond coating is missing from the front side of the drill tip.

Picture left: new drill
Picture right: used drill