Based on this product's specifications, here are some alternatives and similar models
Ring binder LEITZ 180° WOW A4, green, 52 mm spine, cardboard
Summary description:
LEITZ 180° WOW ring binder for A4 documents, made of cardboard with a 52 mm spine capacity. The binder features a 180° opening mechanism for flat document access and measures 318 x 285 mm (H x D). Ideal for archiving, office filing and presentations; supplied in green and sold as a single unit.