【Great Fitness Accessory】: The bearing pulley wheel replacement is a great accessory for fitness equipment and can also be used for garage door pulley systems. And it is suitable for fitness club, family fitness, business or one own use. 【Premium Quality】: This brand new bearing pulley wheel is made of high quality nylon material, which is durable, wear‑resistant and waterproof. It is not easy to break, has quality and long service life. 【Easy to Install and Detach】: The universal pulley wheel is easy to install and detach, and it is easy to install at altitude, which is a great replacement for fitness equipment. 【High Safety Performance and Stability】: When using the 100mm bearing pulley wheel, there will be no friction spark, and it has a high safety performance and stability. 【Product Specification】: Item type: bearing pulley wheel; material: nylon; wheel outer diameter: approx. 100mm/3.9in; wheel inner diameter: approx. 10mm/0.4in; bearing thickness: approx. 24mm/0.9in; groove depth: approx. 10mm/0.4in; groove width: approx. 5mm/0.2in; weight: approx. 1090.0g/38.4oz.