Packing:10pcs hinges Material: iron, anti-corrosion, durable, wear-resistant, does not fade, very smooth and shiny. Size: 5.1×3.1×1.0mm. hole diameter: 3.5mm. shaft diameter: 4.5mm. Features: Ball bearing hinges have been popular for their smooth operation, durability, long-lasting design, and ability to withstand greater loads than standard hinges. Fits standard interior residential doors where a pair of hinges is sufficient., Manufacturer: Shun Yingtong