... 2)excellent technique 3)good performance 4)roller shutter door ITEM NO.500KG HH-AD24-500 Roll Up Door OpenersMain specifications and technical parameter1. ... manufacturer of rolling door motors, fireproof door motors, AC&DC door motor, Garage Door and Entrance Gate Operators, garage door opener and other related peripherals. ... District, Zhangzhou, Fujian, China. 500KG HH-AD24-500 Roll Up Door Openers