High-speed steel twist drills are coated at the tip with a medium-fine diamond grit for drilling stones, ceramics, glass and other hard nonmetallic materials. Use water as a lubricant. Available individually or in a set of all 12 sizes.
| Abrasive | Diamond |
| Bur Material | Diamond |
| Country of Origin | Taiwan |
| Diamond Grit | Medium/Fine Grit |
