Surface Mounted Automatic Door closer, Fine workmanship and . Spring loaded with adjustable tension, Adjustable Screws For Slow or Fast Closing. Material: aluminum body + chrome steel accessories; The support is made of chromed plastic, the plastic supports are used to avoid the friction noise of the metal (do not over tighten during installation) Suitable for doors opening to the left or right. Door frames and doors must be parallel. If the door is higher than the door, you need to use wooden blocks or other materials to lift the support and parallel to the door .Door weight ? 66 lb, door width ? 1000 mm, opening angle of the door up to 150 .Suitable , office, hotel room doors etc indoors use. color:Black Material: Package Contents: 2 x door closing device Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.