Acts as anti-lift protection on shutters and allows obstacle detection function of motors to work.

• Includes 2 rings for quick attachment without tools.
• Can also be fixed on the shaft where the motor is located.
• Suitable for 8K40 shafts.
• You need at least 2 per shutter.

To see how many you need for your roller shutter:

• The springs should be a maximum of 60 cm apart.
• There should be a maximum weight of 13 kg per spring.