These panels are actually plastic. but if aluminum, would do the same. used round countersunk magnets with a hole, used nuts and bolt to attach to the board. had to lay it out in advance and then mount the board after. Revolvers don't lay flat, so attached bracket to the board and then magnets to the bracket. for rifles, used standard peg board hooks but coated them in plastic-dip. used small panels so I can take them down if I need to rearrange anything.How do you attach magnets to aluminum?