Based on this product's specifications, here are some alternatives and similar models
Corner Bracket DMX KP5 140×140×65×2.5 mm, angled wide corner fastener
Summary description:
DMX KP5 corner bracket measuring 140×140×65×2.5 mm — an angled wide corner fastener designed for joining or reinforcing wood and metal structures. Its compact L-shape and 2.5 mm steel thickness provide stable support for frames, shelves, and furniture assemblies. Suitable for construction, carpentry, and DIY repairs where rigid corner reinforcement is required.