A heavy bolt or lock that can only be removed with a special bolt or cable cutter. They will not keep out a determined thief, but they do make it more difficult to break into a container
Association of Marine Underwriters of San Francisco (AMUSF), Glossary of Marine Insurance and Shipping Terms, http://www.amusf.com/Definitions_A.htm, CA, USA 2011. (Mrtm Insur and Shipping - Amer) {575}