New answers tagged bolts
Those look like concrete nails to me. Might have been hand-hammered in, but if it's somewhat recent, it was probably driven in with a powder-actuated system. You don't usually try to pull these out. My advice is to cut/grind away the head. You can do this with a Dremel tool and an abrasive disk; it will take a while, but it's simple to do and easy to ...
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