12pcs 4-50mm Diamond Hole Saw Drill Bit Set
--This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and only needs
If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much. You're drill bit should never be hot to the touch, not even warm.
--Always use water for lubrication., otherwise the diamond core drill will burn.
--Can be used with a standard electric drill.
--Start your hole diagonally, make a round trace and then hold drill straight.
--Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.
The general rule is the smaller the diameter of your drill bit, the faster drill speed you can use. The harder your material, the slower drill speed you should use.
The shank diameters of the Diamond Drill Bits are:
The shank diameter of 8mm diamond drill bit is 6mm.
The shank diameters of 10mm and 14mm diamond drill bits are 6.8mm.
The shank diameter of 16mm diamond drill bit is 7.1mm.
The shank diameter of 18mm diamond drill bit is 8.5mm.
The shank diameters of other diamond drill bits are 10mm.
12Pcs * Diamond Coated Drill Bit