above or one of a similar nature the length of the retractable pins will determine the degree of non uniformity of the work object to be held since as soon as any pin u201c bottoms out u201d the vise can close no further the forces on the object will be non uniform to the degree that the object is non uniform however given the large number of pins the distributed holding forces on the work object will generally be quite substantial to the extent that the work object is non uniform pins 27 will provide lateral support only achieved in an ordinary clamping vise by means of high and potentially destructive clamping forces as shown in fig1 3 flexi vise 10 is also unique by the means provided for opening and closing the vise instead of the traditional threaded shaft that is generally used to drive a vise closed a dual ratchet system is employed the major advantage of the threaded drive is its mechanical advantage the disadvantage is the amount of time it can take to open or close the jaws the required motion which describes a circle parallel to the user 39 s body is also awkward the arms can generate far more power.