Diamond core bit

Whole 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.