Based on this product's specifications, here are some alternatives and similar models
Castor wheels Lanberg AK-1601-B
Summary description:
The Lanberg AK-1601-B castor wheels are designed for easy mobility of rack-mounted equipment. This pack includes 4 durable black wheels that provide stability and support for your setup. Ideal for moving heavy racks effortlessly, these wheels are a practical addition to any workspace.