This heading refers only to the type of anchors used for mooring ships of all tonnages, offshore-platforms, buoys, beacons, floating mines, etc.; it does not include other articles sometimes called "anchors" (e.g., those used for joining masonry or for fixing rafters to the walls of buildings).
Anchors may be fitted with a cross piece or stock, sometimes of wood, and the arms of flukes may or may not be rigid. The heading also covers grapnels; these are smaller than anchors and have more than two arms (usually four) but no stock. They are used for anchoring small craft, to seize hold of other craft, etc., to retrieve sunken objects and to obtain a grip on trees, rocks, etc. The heading also covers parts of anchors or grapnels.
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