This test is carried out internally by the company. The capacity to perforate is measured by a machine of our own production, calibrated by an electronic dynamometer on the average force applied by a man of medium build. The knife is fixed on a sliding structure and falling from a certain highness tests the capacity of perforate a NATO folded belt. The test has been carried out on 4 lay folded belt. The calibration has been carried out hitting from down side, from upper side and from lateral sides. The handle has been fixed to a dynamometer which has registered the maximum stress. So it has been estabilished the medium stress to be used for the test evaluation.