Brand: Herman Miller Product Name: Flo Monitor Arm (FLO) Color: White Compatible Desk Thickness: 12mm-25mm tabletop thickness It stays in place when you intuitively move it. (It is loosened for shipping, so please adjust the tension with the hex wrench.) Used item, but in good condition. Please refrain from purchasing if you are concerned. Please note that it will not attach if your monitor does not have VESA mount screw holes on the back. The necessary wrench and screws required to attach the adapter to the back of the monitor are also included.