1. flush ceiling installation, 2.telescoping arm ceiling installation, 3.wall installation,?solid construction?made entirely of high-grade steel?supporting projectors up to 40 lbs(18kg), wall-hanging 20 lbs(9kg).note:if used in large projectors, the stand may bend.made of high-quality steel, it is strong and can effectively prevent rust.the shortest ceiling installation is 4.72 inches,and with the projector arm,it can be extended to 16.92 to 25.6 inches.it can be adjusted to the length you need.rotate adjustment left and right 15 degrees,roll:+/- 8 degrees,swivel:360 degrees,you can lock in any position.max loading:65 lbs(under the premise of firm installation).universal mounting design enables this bracket to fit the majority of projector brands on the market with mounting hole distance ranging from 8.9? to 12.4?.integrated cable management keeps everything clean and organized, which aids in smooth adjustment by keeping power cords and cables safely contained.