The Weed Wrench tool is 100% guaranteed for function, materials and workmanship. If the Weed Wrench you buy is not effective for your job, or if you want to exchange it for a different size, or if it has a manufacturing fault, we are happy to help you. You can return your Weed Wrench to us in new condition and we will exchange it for you or refund your purchase price. If the reason for return is due to a manufacturing fault, we will pay the return shipping for the faulty part (head or handle), repair or replace it, and return it to you for free. Otherwise, shipping charges for return transactions are the responsibility of the customer.