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CCCs will send you letters using such terms as "pre-qualified" or "pre-approved." The key word in most of these offers is the prefix "pre." Carefully read the terms of the offer. Most will say that they are contingent upon your consent to do a hard pull for final approval after their review of your CR.
If it isnt a firm, unconditional offer for credit, which it probably isnt, then there are no guarantees for final approval, only that they willl do a hard inquiry, and post it on your CR.