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What are these metal things sticking out from my basement walls? Can they be removed? If so, how?

enter image description here

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21  
When you come to move, you can pull these to fold the house up. Make sure you take the furniture out first. – Max Williams Jan 15 at 16:23
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@MaxWilliams - Wait wouldn't you be inside? This obviously wasn't thought out right. – DMoore Jan 15 at 17:34
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You pull it and run. This was the pre-health-and-safety-gone-mad era. – Max Williams Jan 15 at 17:35

They look like the form clips where large forms were held in place to pour the walls. They can be handy as anchors if you add furring strips to drywall the walls instead of drilling for supports. They were just there for the pour and can be removed.

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My wall contractor used metal spikes (square). Our flooring guy wouldn't touch the job until we broke every single one of them off. We were planning on using them as anchors for wall material.. – Chris Kaminski Jan 15 at 20:11
    
Use a grinder, only way to remove them – ppumkin Jan 16 at 19:14

For form leftovers like this we usually hit them with the angle grinder and then go back and forth with pliers until it snaps at wall. I wouldn't just directly hammer these as you might be surprised at how big of a chunk of wall you take out with it.

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They're left over from the forming system the contractor used. You may remove them by striking them sideways with a hammer or repeatedly bending them with any other tool. They're hardened steel and will snap off.

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