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

White Twinslot Shelving Bracket twin slot shelving bracket A small shelf bracket to fit on a twin slot vertical shelf mounting system twin slot brackets Yes, the twinslot stuff is heavy duty, but use long uprights with several screws into the wall Have used it a lot for shelving both at work and

twin slot 610mm White Twin Slot Shelf Bracket Free Delivery over £250 Top Shelf, the UK's largest range of customisable shelving & storage products