The product is 100% mechanically tested prior to leaving the factory ensures optimal performance and enhanced durability. Professional Installation is Highly Recommended. Left + Right Running Boards + mount brackets+Accessories Related. Price not including installation, professional installation will be recommended.We Guarantee The Good Quality, and Agree 1: 1 Replace For the Defective Goods. We try our best to make our buyers satisfy. We are looking for local wholesalers for business together! We are factory that can supply best support, best quality, best service items for your business chances! If you are interested, we are waiting for your contacting!