316 Stainless SteelCompared with 304 stainless steel, 316 stainless steel is more rustproof, corrosion-resistant and weather-proof, making our washing line pulley perfect for sailing and other harsh conditions. Durable Nylon WheelWith perfect performance of wear resistance and durability, the nylon wheel can reduce friction and noise when using, preventing ropes from scratching. The bearing capacity of each rope pulley is up to 50kg to meet your daily needs. Sturdy Stable StructureThe riveting technology is applied to reinforce the whole nylon pulley roller and provide a sturdy structure. No need to worry about breaking during use. 360 Rotation RingThe 360 degrees swivel ring of our heavy duty pulley block can prevent different kinds of ropes from knotting, providing the safest product for you. Indoor Outdoor ApplicationOur 25mm single pulley block can be used with steel wire rope, cable, wire, chain, belt and other rope tools, perfect for sailing, canoes, curtain, clothes lines, mining, etc., making your work easier with the small item.