Our American Walnut Herringbone Flooring is 18mm thick with a 4mm solid hardwood wear layer. Coming with an impressive 25 years manufacturer’s warranty it is also suitable for commercial use. This walnut product is elegantly pre-finished with more than 7 coats giving it ultimate protection and durability. Each plank has a 4V bevelled edge groove, giving each plank more natural definition. This floor can be sanded down up to 5 times however it shouldn't be necessary to do so for the first 15-20 years.