【Premium Material】304 stainless steel makes it sturdy, anti-rust, wear-resistance and corrosion-resistant with highly strong structure. 【360 Degrees Swivel Ring】4Pcs M25 Single Pulley Block with smooth turning wheel, 360 degree rotation to prevent rope/cable/wire from knotting for your convenient use. 【Small Size Big Capacity】Stainless Steel Wheel: 0.98''/25mm x 0.43''/11mm(D x W), Eye Dia.: 15mm /0.59", Total Height: 85mm/3.35". Maximum loading capacity: 331lbs(150kg). Flexible sliding pulley with heavy load capacity. 【For Indoor and Outdoor】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. 【Package Included】4Pcs x M25 Single Pulley Block Designed for use with rope/cord/wire indoor and outdoor application. Suitable for large kayaks, canoes, factories, construction, shipping, mining, household. Perfect for Garage, Machine Loading, Curtain, Clothes Line, Dog Pulley System etc.