The plastic square cap is designed to fit 40x40mm square tubes with a wall thickness of 1-3mm. It serves as a protective cover for the ends of the tubes, offering a clean and finished appearance. Made from high-quality plastic, this cap ensures durability and longevity. It is easy to install and provides a secure fit, effectively preventing dust, debris, and moisture from entering the tube. Whether for industrial applications, construction projects, or DIY crafts, this plastic square cap is a versatile solution for protecting and enhancing your square tube assemblies.