Mann Co. Supply Crate Key
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Mann Co. Supply Crate Keys are single-use tool items which are available from the Mann Co. Store, and were made tradable in the October 20, 2010 Patch. They are the only method to unlock crates, another type of item which occasionally contains a singular rare item.
This item is a Tool. It can only be applied to the Mann Co. Supply Crate in your backpack, and is consumed in the process. Click the 'Use with...' button in the backpack to start the process of applying it.
Key-usage demonstration
