The robust concealed belt winder from Schellenberg is perfect for window and door roller shutters with a maximum height of 2.3 m. When purchased, the roller shutter belt coil of the inlet winder is already pre-tensioned, so that the belt strap can be wound up more easily. The spool is also variable, so that the installation depth of the belt winder can be adjusted variably - from 115 mm to 135 mm. The inlet winder is purchased without a roller shutter strap and without a cover plate.