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 1). Extension spring:  
 2). U-bolts and Iron cast:  
 3). Nylon drum wheel:  
 4). Aluminum guide track:  
5). Aluminum bottom rail and seal:  


Download：roller door accessories.rar
Add: 511-760# RD. Meicun Wuxi Jiangsu China     Tel: 0086-510-81155809     Fax: 0086-510-81155809         E-mail: sales@yonghong.net      info@yonghong.net