ISO BU442 Type 304 Stainless Steel Heavy Duty Buckles 1 1/4" - 25 per Box. It Straps On, Inc., Type 304 Bigger buckles are best used for heavy duty jobs and with ISO band 3/4" x .044", won’t oxidize and are corrosion resistant except in the most demanding environments. ISO is an American manufacturer and our stainless steel is melted and manufactured in the USA to ASTM Standards. It Straps On, Inc. products are the perfect choice anytime your application requires strength, durability and corrosion resistance. Easily installs with ISO band using the following tools: Bigger Tool #T402 and Wider Ratchet Tool #TCP111