The product is a belt designed to fit John Deere 635FD and 640FD headers, specifically replacing OEM part number AXE36550. It is a unit quantity of 1 and is compatible with John Deere models 635FD (s/n 785000-later) and 640FD (s/n 785000-later). This belt is essential for the proper functioning of heavy equipment parts and accessories, specifically in the agricultural industry where John Deere machinery is commonly used.