The rotating and pivoting Crossover Vise Positioner/Holder allows any vise or other mounted attachment to be positioned then locked in place at almost any angle you desire. It can be set up in a variety of locations (e.g., workbench, wall, truck/UTV hitch, pedestal) and accommodates a wide choice of attachments, including: portable welding table, chainsaw maintenance station, small engine support, electric motor and water pump support, adjustable trailer hitch and support, bench vise plate/platform, and wood carving plate/post.