... ,UL,CCC,CB 11 years industrial roller door manufacturing experience 20 years warranty Shinilion Large External Roller ShutterDesigned with individual ... Finish: Powder Coating 7) Mterial: 6063T5 aluminium 2.Rolling Industrial Door Quality Control: (1) Material Select: Using 97% purity ... ingot (2) Production Standard: Highest standard in China Large Aluminum External Roller Shutter door industrial