Based on this product's specifications, here are some alternatives and similar models
Cross connector 4-hole 57×57 mm, galvanized — ELKO-BIS 1.1 OC
Summary description:
ELKO-BIS cross connector 1.1 OC is a galvanized 4-hole metal fitting with overall dimensions of 57×57 mm. Designed for structural joining of steel profiles, channels or frames where a four-way intersection is required. Provides corrosion-resistant mechanical connection for metal construction, shelving, support frameworks and industrial assemblies.