4 Post open Frame Rack provides users with a versatile, customizable solution engineered to meet a diverse set of rack mounting needs,they are compatible with 19" equipment. Range in heights from 5U to 60U, this rack optimizes cooling and promotes easy wiring, making it ideal for high-density installations. It is perfect for data center deployment. This rack features square holes for cage nuts works perfectly with tool-less rails, and it's quick and easy to assemble.