These loose leaf binder rings can be used to bind documents or link multiple different materials together, great for binding business cards, memo files, key rings, scrapbooks, photos, books and contracts. Fit for home and office storage..SpecificationColor: PinkMaterial: MetalThickness: 2.2mm / 0.08 inchOuter Diameter: 30mm / 1.18 inchPacking List: 12pcs x Loose Leaf Binder RingsAdvantageThe round spring ring is made of metal material, the surface is painted, anti-rust, sturdy and durable, and has a long service time.Spring clip design, easy to open and close, quick release. The spring snap clip is lightweight and easy to carry.InstructionAssemble your items in order, then punch holes with a hole puncher. Gently pull up to open then put the ring through the hole and press to close.