Spring box flywheel box
[Outer diameter] : 220mm
[Inner diameter] : 70mm
[Product Height] : 82mm
Matching pipe diameter: 80-83mm
[Applicable door width] : 3-5m
Can be customized according to your requirements
1: Name: spring box, shutter door accessories, shutter door accessories.
2: suitable for the old manual rolling gate.
3: material: galvanized iron. Protective shaft iron ring + nylon ball
4: material thickness :0.75mm*0.85mm*1.2mm according to the size of the outer diameter and inner diameter of the bead used for different.