In a conventional chuck, all drive parts move in the same direction around the centre (e.g. wedge bar, wedge hook, scroll), either towards or away from the centre. The drive of the INOFlex^®-4-jaw chuck ( concentric compensation ) moves towards or apart on two parallel axes. Compensation is provided by connecting the diametrically opposed slides with levers or a sliding sliding gate-type gear. The compensating technology allows round, cubic, geometrically irregular workpieces to be machined concentric to the clamping device/ rotary axis in turning and milling operations.