The ReactionArm absorbs shock, torsional forces and impact force from power tools, potentially reducing carpal tunnel injury and cumulative trauma disorders, the manufacturer says. A variety of tool holder designs and end joints are available, and special designs can be provided. Pneumatically operated, the unit requires clean, dry input pressure. The design includes precision bearings and thrust washers at rotation axes for smooth motion. Middle-joint leveling prevents second arm drift, and remote start circuitry is available to ensure breaks are engaged prior to vertical torque.