Expansion anchor
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Expansion anchor
Bolt that is inserted into a hole drilled into masonry or other material, with a device on the end that expands, prohibiting the bolt from being withdrawn.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
expansion bolt

expansion bolts
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.