Product Description: Advantages: 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.Deep groove ball bearings, fashionable, slide flexible.4.The product is outer ring with U-shaped groove pulley bearings, made of Engineering plastics,compression wear.5.Each can load 93kg,good to use and long service life.6.Suitable for furniture hardware accessories,Doors and windows pulley. Specifications:Material:Engineering plastics + Bearing SteelColor:Black Inside Diameter: 8MMOutside diameter: 40MMThickness: 10MMSlot width: 6.2MMGroove depth: 3.5MMGroove arc: 3MMLoad: 93KGSize:0.8 x 4 x 1cm/0.31 x 1.57 x 0.39 inch(ID x OD x T)Weight: 41g Package include:2 x Bearing Pulley Wheel Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store