Features: 304 stainless steel makes it sturdy, anti-rust, wear-resistance and corrosion-resistant with highly strong structure, heavy duty rigging hardware. Single pulley Set with smooth turning wheel, 360 degree rotation to prevent rope/cable/wire from knotting for your convenient use. Workable with rope or cord indoor and outdoor for flexible sliding pulley. Easy installation for large kayaks, canoes, factories, construction, shipping, mining, household. Perfect for garage, machine loading, curtain, clothes line, dog pulley system etc. Designed for hanging weight things to lighten load. Using gravity and skating to lift. Durable, strong, reliable, waterproof, anti-rust, anti-high temperature, corrosion resistance. For outdoor rock climbing rope ice belt lifting sling. Specifications: Material:Stainless Steel Size: Approx.4.5cm/1.77inch Maximum load: 50 kg Package Includes: 5x Pulley Block note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.