Substantial fixed bracketSubstantial retaining bracket can be used to mount your CPU either underneath or on the side of a desk.Suitable for Tower processors only.Bracket adjusts for width and height of CPU, 230mm and 620mm respectively. Bolts tighten securely to hold CPU safely in place. Suitable for mounting under or alongside a surface a minimum of 25mm thick.Optional bracket available with this model, for CPU rotation through 180 degrees - plus forward and reverse movement. .All CPU Holders are provided with screws and attachments.