Concave burr are made of 80# premium diamond particle for sharp cutting All of diamond burs are 1/8'' shank fit rotary tools, drill and pneumatic power tools Concave arc shape grinding head design suitable for bracelet / ring making Great for field stone, ceramics, glass, agate, tile, marble , jewelry, rock etc Be sure to cool the water (like a drip device in a hospital) when you carving Product name: Bracelet/Ring making tools diamond burr stone carving set.
Product details: Made of premium diamond particles, durable and sharp cutting.
Product used: Fits for electric rotary tools, drill press, die grinder and pneumatic power tools.
Widly used: This diamond burs suitable for grinding and carving field stone,ceramics,glass,carbide,tile,marble,jewlry,rock etc.
Highly recommended for crafts, hobbies, home repair, jewelry,lapidary use, modeling, and so much more.

Warm Prompt:

1. On the new tools must be installed when the tool is to try whether the beating. have to adjust to not jump to use. Otherwise the tool is quickly worn out and the carved object are not very smooth.

2. Be sure to cool the water (like a drip device in a hospital) when you carving. if dry drilling then the diamond on the head of the tool is graphitized by overheating, and it is quickly worn out.