This tip of this hollow brass drill measures 2.57mm on the outside and 2.01mm on the inside. Use this hollow brass drill with Diamond Drilling Compound to make holes in stones without cracking them. Gently apply drill to surface on which diamond compound has been applied. Use slow speed and let up on drill frequently. Makes perfect holes in onyx, ruby, etc. Due to large shank size, use with #30 handpiece. Must be used with Lubricant/Thinner.
| Bur Material | Brass |
| Country of Origin | Philippines |
| Shank Size | 3mm |
| Size | 2mm |
