Item Type: 4 Hole Binding Rings Inner Diameter: Approx. 12mm / 0.5in Uses: Stationery accessories binding consumables 1、SPECIFICATIONS: Including 70pcs plastic binding spines, 4 hole design, with 12mm inner diameter, sufficient quantity for easy use and replacement.  2、PLASTIC MATERIAL: These binding rings are made of excellent plastic, which have light weight, wear and scratch resistant and have a long service life.  3、EASY OPERATION: Just punch the appropriate holes in the paper for manual binding, suitable for office, school or home use, convenient and practical.  4、GOOD PERFORMANCE: These binding spines have good surface gloss, strong adhesion, not easy to break or fade, easily bind paper and store for a long time.  5、7 DIFFERENT COLORS: These plastic binding rings come in different transparent colors for easy identification and are used in a variety of DIY binding projects.