| UD-10 | 95% 3 micron diamond | non-ferrous and non-metallic |
| UD-20 | 90% 4 micron diamond | Aluminum - If <8% |
| UD-30 | 92% 5 micron diamond | Aluminum - If <12% |
| UD-40 | 94% 25 micron diamond | Al-Si alloys> 12% |
| UD-50 | 95% 4/25 micron diamond | Duraluminios, Alloys Al / Si> 12% |