Plus HF allow you to exchange tools without question and receipt. Snap On requires receipt so their lifetime warranteer is pretty useless especially for a DIY that don't buy off of the truck (truck guy won't exchange).
Here's one thing on HF's website:
WARRANTY INFORMATION
Hand Tool Lifetime Warranty
Lifetime Warranty on Hand Tools — We guarantee our Hand Tools to be free from defects in material and workmanship for the life of the product. Limitations apply. Harbor Freight Tools will replace any hand tool that fails to properly work during the lifetime of the original purchaser. In the event an identical item is not available as a replacement: Harbor Freight Tools reserves the right to substitute a substantially similar item in its place. This warranty gives you specific legal rights and you may have other rights that vary from state to state.
Then there is:
Limited Lifetime Warranty on Hand Tools
Harbor Freight Tools makes every effort to ensure that our products meet high quality and durability standards and warrants to the original purchaser that eligible products are free from defects in material and workmanship for the life of the product. This warranty does not apply to damage due (directly or indirectly) to misuse, abusenegligence, accidents, repairs, alterations outside our facilities or to lack of maintenance. We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, special or consequential damages arising from the use of our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
To take advantage of this warranty, the product or part must be returned to us with transportation charges prepaid. Proof–of–purchase date and an explanation of the complaint must accompany the merchandise. If our inspection verifies the defect, we will either repair or replace the product at our election or we may elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our expense, but if we determine there is no defect, or that the defect resulted from causes not within the scope or our warranty, then you must bear the cost of storing and returning the product. This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. Harbor Freight's lifetime tool warranty is one of the strongest in the business, and one of the main reasons for millions of satisfied customers!
Warranty/Return Checklist for All Refunds
•Proof of purchase (e.g. receipt, invoice) is required for all returns.
•A valid, government-issued ID must be presented at the time of return (in store).
•High dollar items may be refunded with a check (in store).
•Items cannot contain oil or gas in them at the time of return for safety reasons.
•Shipping and handling charges are non-refundable.
•Generators and other specific items are subject to a 20% restocking fee.
Looks like you need a receipt and/or proof that you are the original purchaser.