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An entrenching tool (UK),[1][2]intrenching tool (US),[3][4][5]E-tool, or trenching tool is a digging tool used by military forces for a variety of military purposes. Survivalists, campers, hikers, and other outdoors groups have found it to be indispensable in field use. Modern entrenching tools are usually collapsible and made using steel, aluminum, or other light metals.