Features: Designs to convert hinged Door into Closing for added convenience and safety. Make from aluminum alloy, this door features tight arm connection point and adjustable closing force, ensuring high performances and long terms use. Suitable for right and left opened door, wood and metal door, residential and commercial door, exterior/interior door closer, fire door. Safety spring door closer with smooth closing technology removes the bounce from your closing door and allows you to get through with ease. Easy to install the door closer on the door by coming screws. This door closer is to reduce the intensity when you close door to protect door from damaging and reduce the noise. Specifications: Material: Aluminum alloy Type: Long/Short Long length: about 19cm/7.48inch Short length: about 15.9cm/6.26inch Package Includes: 1set Automatic Door Closing Hinges note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.