Dremel Diamond Drill Bits For Glass, Brand Name : More super

hole saw core drill, hole digging tools
Glass drill bit 
D 5mm-150mm
L 75mm,95mm
T 1.0mm
Thread size :12" , 14"
Machine: bench drilling machine
glass drill bit Usage:
Drill Glass, Tile Bottles, Blocks Jars, Fiberglass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone
features:
1 fast drilling speed,
2 high efficiency and less chipping,
3 minimum material deformation
4 long life
Technology Description
Diamond core drill bits and diamond hole saws have a hollow center and cut a circle in the material
To create a hole. This results in a hole the size of the drill and a smaller "plug" or "core" which comes from the center. The advantage of a hole saw style drill bit is that is only drills out a small portion of the hole - about 10% compared to a solid drill bit. When drilling in soft materials, a hollow drill bit becomes most effective at about 1", however, in very hard materials, they are preferable to solid bits for even small sizes.