Our 30 day Guarantee assures that you will not receive an item that doesn't function as intended unless otherwise stated. We 100% thoroughly inspect and test every function of every item we sell before shipping it out to you, our customer. We are highly trained in inspecting and testing with over 25 years experience of repairing power tools. But if for some reason you do receive an item that doesn't function as intended, we will refund your money excluding any shipping charges. Please see Returns for more information.