A support accessory is disclosed for a hand tool, such as a grinder or polisher. The support accessory is configured to be detachably fastened to the hand tool. The support accessory includes a frame with a longitudinal beam configured to stabilize the hand tool front-to-back when the hand tool is fastened to the support accessory, as well as a trunnion rotatably coupled to the frame and configured to stabilize the hand tool side-to-side when the hand tool is fastened to the support accessory. The support accessory is also configured to support the hand tool in a position that is substantially parallel to a surface of a workpiece during use.