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box wrench[′bäks ‚rench]
A closed-end wrench designed to fit a variety of sizes and shapes of bolt heads and nuts.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A wrench, usually double-ended, that has a closed socket which fits over the head of a bolt or a nut.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.