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The 316 stainless steel expanded sheet has a flat, unpolished (mill) surface. The 316 stainless steel grade provides better corrosion resistance than 304 stainless steel, especially in marine environments. It is typically nonmagnetic. The flat sheet has been rolled for a smooth, level surface.Expanded metal sheets are created by slitting and cold-forming metal as it expands in a press. This process creates diamond-shaped openings that are nominally measured the long way of the diamond (LWD) and the short way of the diamond (SWD). Raised, or standard, expanded sheets offer a skid-resistant surface and a high strength-to-weight ratio. Flat expanded sheets have been rolled for a smooth, level surface. Expanded metal sheets are measured by the percentage of open area, which is the ratio of open space to total space in a given area. A sheet with a larger percentage of open area contains less material than one with a smaller percentage.