Based on this product's specifications, here are some alternatives and similar models
Circular saw blade Proline 84509, diameter 50 cm, bore 3 cm, 1 pc
Summary description:
Proline 84509 circular saw blade with a 50 cm (500 mm) diameter and a 3 cm (30 mm) bore, supplied as a single piece. Designed for use on compatible circular saw machines or saw benches that accept a 30 mm arbor. Suitable for cutting large timber, boards and construction materials where a 500 mm blade is required.