6.COST-EFFECTIVE: Many accessories included, like screws, screw adapters and fillings to save extra cost for fittings. 7.HIGHLY COMPATIBLE for QKK, DR.J, DBPOWER, Artlii, LoongSon, APEMAN and other projectors with one single mounting screw..1-Year-Warranty. Pls feel free to tell us any problem. 5.24 hrs nice & professional customer service. Specifications: Material: Aluminium Alloy Length:18to 31 inch / 46 to 80cm(extendable length) Rotation:360 degrees Safety load: 12lbs/5.4kg Base Diameter: 4 inch /100mm Package: 1 x Projector Mount 1 x Manual 4 x Screws and Fillings 2 x Screw adapters