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

Are twin slot brackets strong enough to support a shelf layout? heavy duty twin slot shelving EAI Twin Slot Uprights 1000mm White Pack of 2 giovannis gems slot 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

giovannis gems slot Heavy Duty Twin Slot Shelf Brackets; Fits Spur Twin Slot Wall Uprights; Ideal for wood Shelves; Screw Hole in underside to secure to shelf

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