B-Line Eaton series double sided 18 inch shelf width distribution , 138" height, 31.62" length, 18" width, 8 vertical with 16 shelves, ASTM A36 struct

It is the steel skeleton that holds terminal blocks for central cross connects in a telecom or MDF room. Double sided means shelves face out on both sides of the frame, so you can terminate and cross connect from front and back instead of only one face. The SB60213808TG is configured with 8 verticals carrying 16 shelves, giving you two shelf levels per vertical across the full 138 inch height.

18 inch shelf width, which matches the 18 inch overall frame width. That is the dimension to check against the depth of the terminal blocks or connecting blocks you are mounting, since block mounting plates are sized to the shelf.

Go double sided when you need cross connect capacity on both faces of one footprint, typically a central MDF where feeder terminations sit on one side and distribution on the other. A single sided frame is the right pick when the frame goes against a wall and only one working face is accessible. The SB60213808TG is the double sided build, 8 vertical with 16 shelves, so it needs clear working aisle on both sides.

Order Eaton B-Line part number SB60213808TG. That is the 138 inch high, 31.62 inch deep, 18 inch wide double sided universal distribution frame with 8 verticals and 16 shelves.

ASTM A36 structural steel with a Telco gray powder coat. A36 is the common mild structural grade used for load-bearing steel shapes, and the Telco gray finish is the standard color for central office and telecom room frames, so it matches existing frame lineups in most MDF rooms.

The SB60213808TG is a structural support frame for terminal blocks, not an electrical device, and no certification applies to it. Any listing requirement on your job will fall on the blocks, protectors, and cable you mount to it rather than the steel.