Reddit reviews Gator Cases Lightweight Molded 4U Rack Case with Heavy Duty Latches; Standard 19.25" depth, 4U (GR-4L)
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Lightweight ABS Construction with Heavy Duty Twist LatchesStandard 19", threaded and field replaceable 7mm zinc-plated steel rack railsRemovable Front and Rear cover for access to Front & Rear rack railsOne pack of 32 Gator Rack Screws included19.25" Rack Depth / 2U Rack Size (7")
It is a 4u Guitar Amp case, I think. Similar in concept to this:
https://www.amazon.com/Gator-Audio-Rack-Standard-GR-4L/dp/B0006JETUM/ref=sr_1_6?ie=UTF8&qid=1487624037&sr=8-6&keywords=4u+amp
I picked it up on Ebay 3-4 years ago, and it's been rock solid :)