Specification:Material: Aluminium alloySuited Door: Stainless Steel Security DoorFeature:- Silent mode on off- Automatic hydraulic cushioning door closers- Latching Speed Control/Dual Valve Closing- Precise sealed,preventing oil leakage-This door closer is suitable for installing in Stainless Steel Security Door- The installation modes of vertical,parallel and slide-rail type all can be chosen at will.- The door closer can be chosen to stop or nonstop at will.- Continuous adjustment of closing and latching speed:the fast speed can be adjusted to within 3s from 90 degree,slowness close can reach to 60s or more.-Includes Mounting accessoryNote:1.We provide clear pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.2.Please allow 1-3mm difference due to manual measurement.3.The color of the actual items may be slightly different from the listing images due to different computer screens, thanks for your understanding.4.No Instructions Included.Professional Installation Is Highly Recommen