Premium Material Single pulley roller made of 304 stainless steel, very sturdy, anti-rust, wear-resistant and corrosion-resistant with very strong structure. Unique Design Fixed top for easy rope handling, smooth roller allows rope to pass through unhindered. 360 Degree Swivel Ring 4 pieces M15 single pulley block with smooth rotating wheel, 360 degree rotation to prevent rope/cable/wire from getting tangled for your convenient use. Load Capacity Stainless Steel Wheel: 0.59''/15mm x 0.28''/7mm (D x W), eye diameter: 11mm / 0.43", total height: 60mm / 2.36". Maximum loading capacity: 77 lbs (35 kg). High load capacity flexible sliding pulley. Wide ApplicationSwivel 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.