Features: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information;2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.This product is a U-shape groove plastic pulley,it has excellent workmanship and small craftsmanship,it is light and convenient to pull and safe to use.4.The pulley bearing is made of POM polyacetal and bearing steel. The bearings are tightly mounted, soft to the touch and no noise.5.More high-end pulleys can adjust the height to compensate for the distance between the door and the track, making the door and track more closely connected.6.High-quality pulleys can greatly promote the use of doors and windows, the pulley is a non-negligible accessory in sliding hardware, such as sliding doors, windows, furniture, etc.Specifications:Material: Industril PlasticColor: White Silver name: BQLZRMax-load: 27kgSize: 0.4x1.8x0.6cm/0.16x0.71x0.24inch(dxDxW)Weight: 10gPackage include:2 x U-shape Groove Plastic Pulley