Blind corner cabinets vary in size.
Blind corner cabinet shelves.
While you may think that they are called blind corner cabinets because you reach in and feel around blindly for what you need they are instead called this becuase of the missing door and the blind side of the cabinet.
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The dimensions were are referring to are the cabinet opening widths.
Luckily there are a couple out there that may work for your application.
Blind corner cabinets are the cabinets in the corner of the kitchen known as the bermuda triangle of kitchens.
Rev a shelf 5psp 26 5 wide by 20 5 deep two tier pull out blind corner base cabinet wire basket organizer.
Narrow opening blind corner cabinet organizer.