... :500-1200mm 2.Door Weight:30-65kg 3.Shape:quadrangle 4.Two speed 5.Material:aluminum alloy 6. ... hydraulic pressure valves.2. Fine oil seal to prevent leakage.3. High quality casting aluminum alloy body coated with three layers ... Testing of Fire Building Materials. 8. Applicable for wood door,steel door,fire door,etc.9. Colour options: Silver, black, gold,white. other ...