What are the dimensions of a KALLAX shelf unit measuring 77x77cm?
The KALLAX Shelf unit measuring 43¾×15⅜×43¾" (White 004.155.99 or Black-brown 404.156.01) is close to the 77x77cm dimensions you're asking about, while an exact match for 77x77cm is not provided in this manual.
From the official Ikea Kallax Shelving Unit 77x77cm manual, page 2
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