The Aluminum Post Ball Cap is specifically designed for 75x75mm tubes, offering a heavy-duty solution for your fencing or railing system. Constructed from high-quality aluminum, this ball cap provides strength and durability, ensuring long-lasting performance. Its sleek design adds a touch of elegance to your outdoor spaces. The HD (Heavy-Duty) version offers enhanced protection and stability. With easy installation and a secure fit, this ball cap effectively seals the top of the tube, preventing dust, debris, and weather elements from entering. Upgrade your 75x75mm tube system with this reliable and stylish accessory.