The material is sturdy and durable, made of heavy-duty steel, with rotating bearings, no noise, can rotate 360°, using locknut, not easy to break, loose and fall off, a variety of installation methods, no need for complex tools, it only takes a few minutes to complete the installation, equipped with carpentry self-tapping screws, installed on the wooden beams of the house, can also be installed on the concrete ceiling, two U-shaped clamps, Suitable for square tube racks with a width of 2.4 inches and a height of 3.3 inches, you can fix the pulleys on the square tubes or wooden posts in different places, increasing the range of use and adding more possibilities, the pulleys are suitable for home fitness or outdoor work, specially designed for home gym pulley system DIY, it is a very good gym workout accessories, the best choice for fitness equipment and tools, if you have any questions or suggestions, please contact us in time, we will listen to your valuable suggestions, your satisfaction is our top priority