The MDM12D is the desk mount bracket for two 15" to 27" LCD monitors. Two monitors to be mount on one desktop side-by-side in one row. It is the twin monitors version of the Allcam MDM1X series (MDM11, MDM12 ...) multiple monitor desk mount bracket with the same black finish, same modules, same features, and same mounting method. The Allcam MDM1X series multiple LCD desktop mount bracket are carefully designed in modules: Pole module (with clamp and cable holders): short pole 44cm (default, MDM10PS), long pole 72cm (MDM10PL), extra long pole 100cm (MDM10PXL) Arm Sections (MDM10AL): if the cantilever arm assembly in your MDM1X bracket is not long enough, you can add one or more arm sections. The long arm sections are 190mm (7.48") long, and the short arm sections are 130mm (5.12") long. Joint locks: these module connect the arm assemblies to the pole. Joint lock single (MDM10JLS) for connecting one arm assembly (one monitor), and Joint lock dual (MDM10JLD) for connecting two arm assemblies (two monitors) VESA bracket (MDM10BKT): these first bolt to monitors, then mount to the arm assemblies or the joint locks. In addition to the preconfigure models (MDM11S: single monitor, MDM12D: twin monitors horizontally, MDM12Q: Quadruple monitors), customers can easily configure / customise a desktop bracket according to their own requirements. With a glass table? or other table which are too suitable to be clamped? try the MMS05 twin LCD Arm table stand.