The German translation for these Groove Knives & Inside Cleaning Knives is Sichtflachenmesser (section 95002) in Demaro catalogue.
Use:
For grooving top and bottom surfaces of welded UPVC-window corners on Ryko & Elumatec, KMW, Urban , Wegoma , Zierke, UPVC trimmer machine. Demaro can also order special design for other machine machines on request.
Please refer to Demaro catalogue for specs and sizes for groove knives