https://www.tripplite.com/smartrack-2u-cantilever-fixed-shelf-60-lb-27-kg-capacity-18-in-457-mm-depth~SRSHELF2P

• Fixed Shelf, 2U Cantilever mount. Required mounting hardware included
• 2 or 4 post rack compatible
• 18 inch shelf depth
• Cantilever shelf supports monitors and other equipment
• Cold rolled steel with black finish.
• Use two shelves back to back to create a deep fixed shelf in 2POST racks