The plastic square caps are specifically designed to fit 45x45mm square tubes with a wall thickness of 1-3mm. These caps serve as protective covers for the ends of the tubes, providing a secure and reliable seal. Made from high-quality plastic, these caps ensure durability and long-lasting performance. They offer a snug fit and effectively prevent dust, dirt, and moisture from entering the tubes. With their easy installation process, these square caps are ideal for a wide range of applications, including industrial projects, construction sites, and DIY crafts. Enhance the functionality and appearance of your square tubes with these plastic square caps.