【Value Pack】This Sliding Door Closet Wheels includes 8 sliding door wheels (4 upper wheels and 4 lower wheels). The dimensions are as follows: Lower wheel: 8.4 x 7.9 x 5.9 cm, thickness 2.5 mm (disc diameter: 3.9 cm) Upper wheel: 4.6 x 3.8 x 3.5 cm (disc diameter: 1.9 cm) 【Durable Galvanized Iron Structure】The surface of the Sliding Wardrobe Wheels has a galvanized metal coating, which will not rust even in humid environments such as bathrooms/kitchens. The sturdy doors offer increased stability compared to standard plastic fittings. Ideal for furniture sliding door accessories often used in apartment buildings. 【Quiet Design and High Compatibility】The stitched sliding door rollers are made of high-quality nylon, which is lightweight, durable, and wear-resistant. The rollers ensure quiet and stable operation and avoid noise during use. The wheels are equipped with an adjustable spring system so you can adjust the height without any tools or technical skills. The sliding door roller