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【High Quality Material】 Black metallic, selected thick cold rolled steel material, strong abrasion resistance, toughness and not easy to break, durable. 【Massive steel ball】 With high-quality steel ball, imported lubrication oil and three-part rail design, it has achieved silence and high endurance throughout the entire process. 【Silent and Smooth】Constructed with a silent steel ball, push and pull smoothly, no noise. Practical unmolding hook: no additional tools are needed for the hook device, which is convenient for installation and removal and saves labor. You can remove the inner rail by simply pressing and pulling the detachment hook. Maximum load: 45 kg.