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No what are they?

https://en.bitcoin.it/wiki/Coinapult
Locks
Coinapult's Locks service allows users to peg the value of their bitcoins to currencies and assets, like USD, EUR, GBP, Silver and Gold. With bitcoin price fluctuation difficult to predict, Locks allows users the ability to utilize the Bitcoin payment network with the confidence of long term price stability.

Good, but I am not comfortable with storing my coins at a 3rd party system.

If this lock system appears in a decentralized form, now that will be the real deal.