I purchased this product because the encapsulation installer (AFS) I hired was planning to use "nail & washer" to attach liner to foundation walls. While I am not a structural engineer, common sense tells me that if you shoot a nail into a cinder block, there is a potential to crack the block. To ensure they would do it the right way, I put it in the contract that they would use pins. While the installer is to bring his own pins, I decided to purchase a few bags to ensure the installer has enough pins to do the job properly (and if they didn't, I will sell them the bags). As a note, AFS is a reputable company; but as a caution, installers will try to get away with doing things the easy and the wrong way. Make sure you watch all the videos on crawlspacerepair.com to understand the work required to encapsulate a crawlspace.

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Very easy to work with and they secure the plastic drape to the foundation walls better than any other product.

I am very happy with the result since we converted a vented space that was a nightmare into one that was actually pleasant to be in. It should pay in utility bill dividends over the next few years.

These pins work great. I overestimated the amount needed to do my job. They're very strong.