The STIHL 31320000072 is a genuine 3/8" Rapid Hexa (RH) saw chain, featuring 72 drive links and a 1.6 mm (0.063") gauge. This high-performance chain is engineered for professional users in forestry and tree care, offering fast cutting speeds, enhanced precision, and extended sharpness due to its unique hexagonal tooth design and narrow kerf. It is specifically designed for use with STIHL chainsaws such as the MS 462, MS 500i, and MS 400 C-M when equipped with a 20-inch (50 cm) guide bar. Sharpening requires a special Hexa file.