The use of square boat nails in China dates back thousands of years, coinciding with the rise of river navigation and maritime trade. Historically, China's rivers like the Yangtze and Yellow River were the lifeblood of transportation and commerce. As a result, the evolution of boat design became closely intertwined with the economic and cultural development of the nation. The square nails, traditionally made of iron or bronze, were instrumental in fastening wooden planks together, forming sturdy hulls capable of withstanding the challenges of open waters.