Item Type: Pulley Block Material: Carbon steel Weight: Approx. 1219g/43oz Package List 2 x Pulley Block 4 x Screw 1Super Quiet: The pulley block is made of special materials and design, which can effectively reduce the noise generated when sliding and maintain a quiet indoor environment. 2Smooth Sliding: The pulley wheel use smooth sliding rollers to ensure smooth and easy opening and closing of the door. You can easily open or close the barn door. 3Strong Load Bearing Capacity: Pulley has good load bearing capacity and can withstand the weight of the door. Whether you are using heavy gym equipment or other heavy objects. 4Durable Structure: Pulley heavy duty block is made from high strength carbon steel material, which has excellent durability. Not easy to damage or rust, can be used for a long time. 5Convenient Installation: Pulley heavy duty block adopts simple installation operation, you can install it by yourself. It is also convenient for you to adjust and replace according to your needs.