Spring Automatic Door Closer Alloy Door Self-Closing Spring Door Closer Surface Mounted Easy to Install Simple-Buffer Automatic Door Closer Features Automatic buffer closing: Reduce door closing speed, prevent damage,extend service life of the door. Double spring structure: Full of power, Strong spring force, suitable for various types of doors. Gentle and silent: Bold arms smooth rollers make opening and closing smooth and silent. Adjustable-door opening force: Use matching wrench to adjust the closing speed according to own requirements. Left or right available: Available on left and right doors, just flip the door closer 180. Specifications: Material: Aluminum alloy Color: Black, White Weight: About 300g Size: 16.7x12.5cm/6.57x4.92in Package: 1 x Simple-Buffer Automatic Door Closer Note: Please allow slight measurement deviations due to manual measurement. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed in the pictures.