4x White Enginering Plastic Roller Wheel Bearing Pulley For Sliding Door 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.Made of Engineering Plastic and steel, good quality and durable.4. The outer dia is 25mm, the inner dia is 6mm, thickness is 7mm, the arc ball radii is 4mm.5.Bearing type is 626ZZ, one pulley wheel can load 87kg.6.Please make sure that the item size will meet your needs before purchase.7.A good replacement for your old and damaged pulley wheel, good parts to DIY your house.Specifications:Material: Engineering Plastic + SteelColor: WhiteSize: 2.5x0.6x0.7cm/0.98x0.23x0.27inch(Outer Dia x Inner Dia x T)arc ball R: 4mmBearing type: 626ZZOne load: 87kgWeight: 39gPackage include:4x Pulley Wheel