116 118 a pair of sandwich clamps 70 are fitted through a pair of holes below the slot 119 in the cross member 112 the cross member 112 slidably engages the tee bars 122 132 respectively to the desired depth the sandwich clamps 70 are tightened to clamp the tee bars 122 132 respectively into the slot 119 of the cross member 112 the cross member 112 further has a leveling device 115 fastened thereon to support a series of cabinets or other similar item the operator attaches installation plates 150 and 150 39 not shown to top plates 95 and 95 39 the height of the workpiece holders 100 and 100 39 are adjusted to the left and right of the device 200 and the cross member 110 is adjusted to the desired width of the cabinet or a series of cabinets the tee bars 122 132 respectively and cross member 112 are locked securely by the clamping means 70 the clamping means 70 on the pair of channel members 60 on both the workpiece holder 100 and 100 39 are loosened the operator then slides the channel members 60 of both workpiece holders 100 and 100 39 respectively to the final height with the base of the leg members 10 angled out slightly from the vertical axis to the wall that the workpiece is being fastened to the operator then locks the clamping means 70 on both workpiece holders 100 and 100 39 and secures the pair of channels 60 to each of the center beam 30 the cabinet is then placed onto the installation plates 150 and 150 39 on top plates 95 95 39 respectively of the workpiece holders 100 100 39 and the final adjustment to the desired height is accomplished after 158 and 158.