Guide Wheel U Type Groove Pulley Roller 8x40x20.7mm 4pcs 0840UU

Application:This U-Groove pulley is widely used in doors and to track and drive mechanical equipment.There are total 4 pieces of pulleys in one set that you many use for many projects.Pulley is a simple machine that can be used to lift heavy loads and save labor. High Quality:The groove wheel is made of high quality metal and plasticmaterial, these pulleys are durable, sturdy and wearable.Most plastics are light, chemically stable, will not rust, have good impact resistance, have good transparency and wear resistance, good insulation and low thermal conductivity. Quality Assurance: Welcome to purchase our products. Our products have undergone strict quality control to ensure that each customer can purchase their favorite products. If you encounter any problems, please feel to contact our customer service, thank you! What Is The Pulley : The pulley is a small wheel with a groove around it that can rotate around the axis. A simple machine consisting of a disk that can be rotated around a central axis and a flexible cable that traverses the disk can be rotated around the central axis. Good Mute Effect:Groove wheel has internal lubrication grease, smooth operation, good mute effect.Grease is used in the friction part of the machine for lubrication and sealing. Also used on metal surfaces to fill voids and rust.And this pulley is U-shape groove design, smooth reduces friction.