Product features: The ball suspension code has a self-locking function, which are mechanically locked through inserting a metallic wire rope. It would be adjusted through pressing and preserving the entrance, could be removed, and may be recycledCan be DIY for any purpose, with a wide range of applicationsMaterial:CopperSurface trea:nickel platingSuitable for steel wire:0.5/0.8/1/1.2/1.5/2/3mmSafe load capacity: Small: 20kgMedium: 30kgLarge: 40kgThere may be errors in manual measurement, please don't mind