On Mon, 10 Apr 2017 00:20:28 -0700 (PDT), wrote:

? 2013?2?26???? UTC+8??9:26:23?Stone Wall Plates???
Drilling granite, who makes a good drill bit,burned up all my diamond boring bits and glass bits, these bits work for awhile?.

we produce diamond drill bit for glass , stone ,ceramic , tile etc.
+86 15810480701


Diamond bits work by scratching. Use light pressure. The diamonds do
not wear out, but can be dislodged from the bit. A constant water
spray or drilling through water will also help them last.

-dan z-