Based on this product's specifications, here are some alternatives and similar models
Diamond Cutting Disc Abraboro AB30000005 300 mm x 25.4/12 mm N5
Summary description:
Abraboro diamond cutting disc AB30000005 with a 300 mm diameter and a dual bore size of 25.4/12 mm (N5). Designed for precision cutting with a diamond cutting edge, suitable for masonry, concrete, stone and tile materials where a large-diameter abrasive disc is required. Fits machines accepting a 300 mm wheel and dual arbor sizes for flexible mounting.