NTV 10 Pack Diamond Drill Bit Set Glass Hole Saw Diamond Drill Bit Hollow Core Drill Bit Set for Diamond Coating, Carbon Steel for Glass Ceramics Porcelain Ceramic Tile Marble 6mm to 50mm

Diamond Drill Bits, are also know as Diamond Core Drill Bits, Diamond Hole Saws or Bonded Diamond Drill Bits. They are often called Glass Drill or Tile Drill, but they are much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.

Features:
This diamond bit core drilling removes a complete circle glass, tiles, marble, granite, ceramic or other material and only needs water for lubrication
Can be used with a standard electric drill (not included)
Easy to use, high quality, good performance, long life
Excellent for making clean and accurate hole on glass, tile and marble Always use lubricant (water), otherwise the diamond core drill will burn
Start the hole diagonally, make a round trace and then hold drill drittoSpecifica

Specifications:
Model: 10 Pcs 6mm -- 50mm
Size: 6mm / 8mm / 10mm / 12mm / 14mm / 16mm / 18mm / 20mm / 30mm / 50mm

Note:
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.
Slowest speed,Coolant,Minimum pressure

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.
Packaged included:
10pcs Diamond Coated Hole Saw Drill Bits