The B-Tech BT8390-VESA400T/B is a pair of tilting interface arms for the System X range, used to hang medium and large screens on BT8390 horizontal mounting rails. They suit screens from 39" to 75" up to 70 kg, with VESA and non-VESA fixings up to 400 mm vertically, and tilt up to +20 degrees in 5 degree steps via tool-less thumbwheels. Levelling screws adjust screen height, safety screws deter removal, and the arms can be positioned anywhere along the rail.