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Um, some of us 56k guys need to taken into consideration, eh. It looks similar to a concrete screw. Hole is drilled in concrete, bottom piece punched in, then screwed screwed in. The screw expands the bottom piece so that it fits into the concrete even tighter. Though, your's looks "light duty" like it's used in wood (?) or something else like that.
Seriously, you need to resize the pic.
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