The 2 post server rack shelf allows you to add a high capacity mid-mount fixed shelf to almost any standard 2 post server rack - This 2U rack shelf is EIA 310 compliant meaning it can fit most standard 19 in. 2 post rack - The 2 post network rack shelf includes mounting brackets that can be adjusted to accommodate different post depths - This durable 2 post network rack shelf is constructed using SPCC commercial grade cold-rolled steel and can hold up to 75 lb. (34 kg) of equipment