Description of Atoplee Diamond Coated Marble Granite
【Good Quality Material】The main material is metal, and the grinding head part is coated with emery, which is hard and wear-resistant. 【Cutting Hole Diameter 】 5 mm / 3/16". 【Size 】49mm shank and 53mm total length. 【Usage】 Suitable for use in drill hole on glass, marble, tile or granite.Please add water for coolant and drill slowly. 【Package Content 】10 x Glass Hole Saws.
As a regular user in the Industrial and Scientific field I was disappointed with this product`s quality .As a result of my tests, I determined that this Hole Saw fails to deliver clean cuts on thicker materials such as marble and granite. On the plus side, the tool comes with a long lifespan. However, the cons outweigh the pros as the rough finish on the cut material requires extra finishing work. In conclusion, I would not recommend this product for cutting thicker materials..
Pros
Durable and long-lasting diamond coating
Cons
Prone to chipping or breakage if dropped or mishandled
By constantly spraying water at these drill bits, they drilled through hard porcelain stoneware where other specialized and expensive drill bits failed. They work really well and at a good price - shipping was ok too