This is a set of 5 boxes of 40-size stainless steel chains (3m each) ☆ 50-size stainless steel chains are also available, so feel free to comment. m(_ _)m Features: The stainless steel chain is made entirely of SUS304 material. Applications: Suitable for use in environments with chemical corrosion from acids, alkalis, etc., places exposed to water or steam, and high or low temperatures. Pitch (mm): 12.7 Roller outer diameter (mm): 7.92 Inner link inner width (mm): 7.95 Country of origin: Japan One box is 8000 yen ☆ If you need 3 or more boxes, please consult in the comments m(_ _)m Katayama Chain SUS Chain