A. The 90mm universal bearing pulley wheel is used for fitness equipment, garage door pulley systems, sliding door pulleys, cable machines, and other spare parts. B. The outer diameter of the weight pulley is 90 mm; the inner hole diameter is 10 mm. The thickness is 25 mm. The groove depth is 10 mm; the groove width is 8 mm. It is suitable for ropes with a diameter of up to 7 mm. C. The inside of the cable pulley is made of solid steel, and the other part is made of durable nylon, allowing the universal wheel to carry a maximum load of 300 kg. D. The 90 mm Nylon Pulley is light, wear-resistant, and has a long lifespan. It operates quietly, produces no friction sparks, has good safety performance, and is easy to install. Nylon wheels have gradually replaced old metal pulleys due to their unique advantages and have been widely used in lifting equipment as tower crane accessories.