■ A holding a work piece or tool continuously in one hand and working on it with the other.■ Reduction of fatigue may be accomplished by using a rapid release holding clamp or vise.■ When sustained holding is still necessary, the tool can be suspended from cables with a balancing system or articulated with anti-torque bars to decrease grip force.■ Heavy parts can be held with a jig or clamp so that the non- dominant hand is not applying a constant grip force.