DiamondPlate Employees Only Signs come either in black or gold. If you’re looking for more color options, you can use one of our templates from our Custom DiamondPlate Signs where you’ll get two more color options - Red and Dark Blue. The anodized aluminum plates feature graphics that are embedded into the pores of the aluminum. The 20 mil thick signs come with 3M adhesive and withstand constant abuse and abrasion due to people touching the sign surface when opening or closing the door.