GN 927.4 clamping levers with eccentrical cam are used for rapid clamping and releasing operations. In contrast to a clamping operation utilizing only threads and a lateral force, these levers permit torque-free clamping via a combined downward vertical and cam actuated motion. The lever has been designed to insure that its movement cannot exceed the maximum clamping position. There are no loose components since all are assembled and mounted in their correct order. With these clamping levers, thrust forces of up to 8 kN (1800 lbf) can be obtained.