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

Twin Slot shelving on slanty wall : rDIY twin slot racking Twin Slot Shelving Kits 1000mm high 4 Shelves The Twin Slot Shelving Kit is an ideal floating shelving solution Free delivery from Manutan UK! twin spin slot We have both genuine Spur and the older B&Q stuff which are interchangeable I found a business seller on EBay who specialises in twinslot and

twin slot shelving spacing Create your own bespoke shelving with two of these White Twin Slot Shelving Uprights and brackets The ideal storage solution for your home