The GMK 12 brushwood mower head is suitable for stronger growth and shrubbery. The GMK 12 is available for right-hand and left-hand work. A protective grille is optionally available for use on crash barriers.
| Technical Data | GMK 12 | |
| Working width | m | 1,20 |
| Mower head height | mm | 760 |
| Drive | V belt drive | |
| Required hydraulic power | ltr./min bar | 68/340 |
| Drive side | Right-left operation selectable | |
| Use of Tasttronic possible | no | |
| Weight (depending on flail type) | kg | 350/400 |