If you are looking for a high-quality, trouble-free, quick-change router chuck, you have come to the right place. As a matter of fact, all of our products come with a money-back guarantee. Use the “Musclechuck™” assembly for 30 days and, if you are not completely satisfied, we will give you a 100% refund, including shipping and handling costs, if you answer just one question, why are you returning it?