Duplex Bearing Detachable 360 Degree Rotation Pulley Block 304 Stainless Steel Pulley Wheel : The U groove wheel is made of 304 stainless steel which has higher strength, super capability and high quality enhance anti-deformation and corrosion resistant performance. 360 Degree Rotation Swivel top ring for ease rope handling, smooth roller provides great rope traverse.pulleys are removable for easy installation. Compared with other pulleys, U groove wheel is thicker, the wheels are stronger and the bearing capacity is stronger. Super Mute Duplex Bearing DesignThere are two carbon steel ball bearings inside the pulley, which can reduce the friction of the wheel. The pulley turns more flexibly and has no noise.The thickened steel plate bracket and wheel core can enhance the bearing capacity. Specifications: U Type Pulley Block. Groove Width: 22mm, Swivel Ring Diameter: 48mm, Overall Height: 107mm, Thickness: 3mm, Max Load Bearing: 500KG/1100 Pound. Wide Application: The U groove wheel is Simple and practical roller, using gravity and skating for lifting work, designed for use with rope or cord in indoor and outdoor applications to hang weight things or lighten load.