Review on JOINER Diamond Masonry Drilling Gemstone by Jack Ford

This is amazing at an amazing price! We drill 1,000 holes a year in blown and molten glass and they work just as well as our expensive water drills. I went through 30 holes before I could tell they were wearing it which is awesome! The trick is that you must have a water dam or running water since you are constantly drilling. A good trick to prolonging their life is to use aluminum construction tape on the opposite side of the glass you are drilling so the tiny rod comes out of the hollow drill bit or it clogs and the number of holes drilled can be limited once. Time like it's too hard to clear the core