The Spring Hammer consists of three principal parts : the body, the striking element and the release system. The body comprises the housing, the guide for the striking element, the release mechanism and all parts rigidly fixed thereto. The striking element comprises the hammer head, the hammer shaft and the cocking knob. The mass of this assembly is 250 g for severities not exceeding 1 J, and 500 g for 2 J. The pressure to release the striking element will not exceed 10 N.