Rolling  Shutter Spring
Application		For spring shutter door
Surface		Polish blue and grey blue
Length		3-4.5m, 5/5.5m
Coil Weight:		1.4kg-2.8kg
Size		1.4*45mm
Grade		65MN

1. How to make sure of the quality?
Answer: We can make deal with Trade Assurance Order through Alibaba and you can check quality before loading.

2.Can you provide sample?
Answer: We can provide sample, the sample is free of charge. You just need pay the cost for courier.