The 50mm Erdanker JF type ground anchors differ from the standard types in that they have a flange on the top. To fit them, the bracket is screwed or bolted to the structure first, then the anchor is hammered through the slot in the bracket which forces the anchor to spiral down. In use, if the structure starts to lift, the slot prevents the anchor rotating, keeping it firmly in the ground. As with all our anchors, removal is straight forward - they are just unwound.