Description of π Diamond Masonry Drill Bit with JINGLING Glass Drilling Capability
The diamond coated hole saw suitable for use in drill hole on glass, marble, tile or granite. Hole Diameter: 5mm (close to 3/16") ;Total length: 50mm (2");Drill depth: 16mm depth. Use with water as a lubricant; Holes require no futher work as cutting Is clean. Start drill at 45 Degree to surface and align to 90 Degree as hole forms. Product Name: 5mm Diamond tip drill bit, 3/16" inch Glass hole saw bit; Please add water for coolant.
They are excellent for Lake Superior Agates. I drilled holes from 6 quarters to 1 inch deep using only 2 drill bits. Keep the water flowing and light pressure, they cut great. Between uses I clean the core, then they cut even better.
Pros
Diamond Coated Hole Saw, suitable for drilling holes in glass, marble, tile or granite