Premium MaterialSingle pulley roller made of 304 stainless steel, very sturdy, rust-proof, wear-resistant and corrosion-resistant with very solid structure. Unique DesignTop fixed for easy rope handling, smooth roller allows rope to pass through unhindered. 360 Degree Swivel Ring4pcs M15 single pulley block with smooth rotating wheel, 360 rotation degrees to prevent the rope/cable/wire from getting knotted for your convenient use. Load CapacityStainless Steel Wheel: 0.59''/15mm x 0.28''/7 mm (D x W), eye diameter: 11mm / 0.43", total height: 60mm / 2.36". Maximum loading capacity: 77 lbs (35 kg). Flexible sliding pulley with strong load capacity. Wide ApplicationSwing pulleys can be used with rope or cord inside and outside for flexible sliding pulley. Easy installation for large kayaks, canoes, factories, construction, shipping, mining, household. Perfect for garage, machine loading, curtain, clothesline, dog pulley system, etc.