Abstract: A left and right hand material support platform-extension each comprised of an elongated flat surface horizontally disposed in use, one lengthwise side edge of each is affixed with a short vertical material guide fence. The bottom surface of one end of each platform-extension has a longer hingedly attached telescopic support leg, with the opposite bottom end of each platform-extension having a shorter hingedly attached leg which is structured for clamping between the panels of a portable work bench of the type having a central full length vise or clamping arrangement. Each platform-extension is essentially a mirror image of the other for positioning one platform-extension on each side of a portable tool having an integral material support platform such as a miter or radial arm saw which is supported conveniently elevated by the work bench containing the vise.