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. 3.10 pulleys in a pack. 4.Made of iron and plastic, with bearings inside it, move smoothly and . 5.Suitable for your wardrobe, bookcase, glass cabinet and other office furniture. 6.Note: The wheel dia is 19mm, please measure your furniture to make sure the pulley meet your needs before you purchase. 7.Caster load bearing: 20KG Note: Not suitable for tracks with wheel spacing + wheel thickness std 35/30. Specifications: Material: Iron & Plastic Color: Silver & White Brand name: BQLZR Size: 4.5x1.9cm/1.77x0.74inch(LxDia) Wheel Dia: 19mm Weight: 157g Package include: 10x Pulley Blocks