Warehouse Pallet Rack Starters & Adders. Bolted Upright Frames – Preassembled pallet rack uprights made of roll-formed steel. Diagonal and horizontal braces are bolted to the frame. Footplates are bolted on to the upright base. Welded Upright Frames – Diagonal and horizontal braces are welded to the upright frames. Preassembled and constructed of roll-formed steel. Footplates are welded to the upright base.