Package Content12 x crane pulley block Type: Single pulley block, heavy duty rigging hardware. High Quality: Made of stainless steel, high hardness, damp-proof, anti-corrosion, rust resistance. Sturdy and Durable: Delicate technology, solid design, durable and wear-proof, strong load-bearing, swiveling flexibly. Flexible sliding pulley with heavy load capacity for numerous application, is workable with rope or cord indoor and outdoor for flexible sliding pulley, easy to install in large kayaks, canoes, factories, construction, shlpping, mining, household. It is perfect for Garage, Machine Loading, Curtain, Clothes Line, Dog Pulley System, etc. Package Content: 3-Pack M20 Stainless Steel Single Pulley Block