This strap reducer makes it much easier to still operate a heavy shutter by hand. You mount this write in place of the standard belt pulley and then you can make your shutter much lighter. It provides a delay of 1:2.

You can use it for a roller shutter with an 8k40 shaft and maximum armor weight of 25 kg or for a roller shutter with an 8k60 shaft and maximum armor weight of 20 kg.

When converting the roller shutter, the following items must be ordered along (see related products below)
- belt pulley 140, 160 or 180 mm
- mounting set
- axle prop 8k40 or 8k60
- extra long belt

For shutters with band retarders, count 4x the height of the shutter to calculate the length of the band.