Are twin slot brackets strong enough to support a shelf layout?

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EAI Twin Slot Wall Mounted Upright Shelving - Pack of 2, Black, 1000mm Strong, Heavy Duty Steel Shelf For Shed, Garage, Indoor Storage

Our twin slot shelving brackets are manufactured from steel with a hygenic powder coated finish Highly durable, each bracket will last a life time under Hi, So I've bought this twin slot shelving system to go up in one of our hallway cupboards

slot zeist trouwen Shelves · Cube Storage · Wall Shelves · Floating Shelves · Shelving Brackets · Bathroom Shelving · Garage Shelving · Twin Slots · Furniture · Furniture Ranges Twin Slot shelving on slanty wall So I happily installed my upright brackets and then put the shelf brackets on, only to find the shelf