These chisels are made of tough selected alloy steel which has been carefully tempered to assure toughness and ample strength.
| Code | Blade Width mm | Length mm | Code | Blade Width mm | Length mm |
| 612901 | 6 | 125 | 612905 | 19 | 190 |
| 612902 | 9 | 140 | 612906 | 22 | 200 |
| 612903 | 13 | 160 | 612907 | 25 | 215 |
| 612904 | 16 | 175 | 612908 | 32 | 225 |