Based on this product's specifications, here are some alternatives and similar models
Plastic Miter Box Topex 320×120×75 mm model 10A846
Summary description:
Plastic miter box Topex model 10A846 with internal dimensions 320×120×75 mm designed to guide saws for accurate angled cuts. Lightweight, corrosion‑resistant plastic construction suitable for crosscuts and miters in wood, plastic and soft composite materials. Useful for DIY, carpentry and small furniture repairs where controlled 45° and 90° cuts are required.