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High-quality material: metallic black, selected thick cold-rolled steel material, strong abrasion resistance, toughness and not easy to break, durable. Solid steel ball: With high-quality steel ball, imported lubricating oil and three-piece rail design, it has achieved mute and the high standard of endurance throughout the process. Silent and smooth: Built in quiet steel ball, push and pull smoothly, no noise. Practical release hook: no additional tools are required for the release hook device, which is convenient and labour-saving for installation and removal. You can remove the inner rail by simply pressing and pulling the release hook. Maximum load: 45 kg.