| CODE DESCRIPTION | |
| 300CHB HB = 0.3mm | |
| 300CH H = 0.3mm | |
| 300C2H 2H = 0.3mm | |
| 300CB B = 0.3mm | |
| 100CHB HB = 0.5mm | |
| 100CH H = 0.5mm | |
| 100C2H 2H = 0.5mm | |
| 100CB B = 0.5mm | |
| 100C2B 2B = 0.5mm | |
| 100CF F = 0.5mm | |
| 50HB HB = 0.7mm | |
| 50H H = 0.7mm | |
| 50B B = 0.7mm | |
| 502B 2B = 0.7mm | |
| 509HB HB = 0.9mm | |
| 509B B = 0.9mm | |
| 5092B 2B = 0.9mm |