They are available in four sizes: 8-space, 12-space, 16-space and 21-space. The racks are set upon 4 heavy-duty, 3-inch (75 mm) casters with locking fronts. Each Samson equipment rack includes a single-space, flanged blank panel. 

The truly innovative thing is that the unique steel support bar construction allows the racks to be assembled to accept either the European or US thread sizes. 

Features: 

• 19-inch equipment racks. 
• Heavy-duty steel construction with fully enclosed sides. 
• 3-inch (75mm) locking casters. 
• Single space blank panel included. 
• Compatible with U.S. and European rack screws.