B-Line Eaton series open racks, Aluminum, #12-24 mounting hardware, Flat black powder coat, Two mount spaces required, 200 lb load capacity, Center m

Yes. The SB5962311AFB is a center mount rack mounted shelf 21.5 inches wide, which is the standard overall width for equipment mounted to 19 inch EIA rack rails, and it depth is 11 inches. It takes two mount spaces (2U) on the rails.

It is punched for #12-24 mounting hardware, which is the thread B-Line open frame racks are tapped for. If your rack rails are #10-32 or square-hole cage nut, the shelf holes will still line up on standard EIA spacing but you need the matching #12-24 rails or hardware to fasten it.

200 lb load capacity. That covers most switches, UPS batteries under that figure, and non-rackmount boxes set on the shelf, but split anything heavier across two shelves or use a shelf rated higher.

Two mount spaces, so plan on 2U of rail. The shelf itself is 2 inches high, and the 11 inch depth means gear deeper than that will overhang the front or back edge.

Aluminum, finished in flat black powder coat, so it matches flat black B-Line open frame racks. The aluminum build is why it only weighs 3.2 lb, which is a practical difference if you are loading out a rack overhead or shipping a populated frame.

A center mount shelf like the SB5962311AFB fastens to the rails so the shelf body sits centered in the frame depth rather than hanging forward of the rails. Choose it on two-post open frame racks when you want the load balanced over the post line instead of cantilevered out front, which is what keeps a 200 lb load from tipping a free-standing relay rack. If you need equipment flush with the front of the rack, a front-mount vented or cantilever shelf is the better fit.