1. Premium Material 304 stainless steel makes it sturdy, anti-rust, wear-resistant and corrosion-resistant with high strength structure.2. 360 Degree Swivel Bushing 4 pieces M25 Single Pulley Block with the smooth spinning wheel, 360 degree rotation to prevent the rope / cable / wire from knotting for your convenient use.3. Small Size Big Capacity Stainless steel wheel: 25mm x 11mm (D x W), eye diameter: 15mm, total height: 85mm. Maximum loading capacity: 150 kg. Flexible sliding pulley with high load capacity.4. For indoor and outdoor use Can be used with indoor and outdoor rope or cord for flexible sliding pulley. Easy installation for large kayaks, canoes, factories, construction, , mining, household. Perfect for garage, machine loading, curtain, clothesline, dog pulley system etc.5. Package Included 4pcs x M25 Single Pulley Block