Based on this product's specifications, here are some alternatives and similar models
Enclosure Accessory Rittal AS 4055.780 metallic, round 21.5 mm matrix
Summary description:
Rittal AS 4055.780 is a metallic enclosure accessory supplied as a round 21.5 mm matrix (matrize) for use in control cabinets and industrial housings. Designed for forming round openings or mounting components, it suits electrical panel fabrication, cable entry or fitting of controls and indicators. Lightweight and durable for workshop and field use.