Warehouse Pallet Rack Starters & Adders. Bolted Upright Frames РPreassembled 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 РDiagonal and horizontal braces are welded to the upright frames. Preassembled and constructed of roll-formed steel. Footplates are welded to the upright base.