Feature:1. 20mm Wheel Thickness: This is a 316 stainless steel spring nylon pulley, the size is 85x40x20mm, and wheel thickness for 20mm2. Strong And Durable: Hook nylon pulley adopt 316 stainless steel material, which is corrosion resistant, strong and durable3. Low Friction And Extreme Durability: Self lubricating nylon pulleys ensure low friction and extreme durability, very practical4. 1500 Pounds Working Load Limit: The rotating pulley block is designed for fiber ropes with a diameter of 3/8in, with a working load limit of 1500 pounds5. For Fitness Equipment: Sheave block head is suitable for fitness equipment and marine sheets, sail cables, control linesSpecification:Item Type: Sheave Block HeadMaterial: 316 Stainless steel, nylonUses: Suitable for fitness equipment and marine sheets, sail cables, control linesProduct Size(LxWxT): Approx. 85 x 40 x 20mm / 3.35 x 1.57 x 0.79inWheel Thickness: Approx. 20mm / 0.79inWheel Groove Width: 3/8in.Package List:1 x Sheave Block HeadNote:This product is made of stainless steel, and needs regular inspection and maintenance during use.