Stainless steel insect mesh is made of the basic stainless alloy (Type 304). Stainless Steel Window Fly Screen Mesh Stainless steel insect mesh is made of the basic stainless alloy (Type 304). It is the most durable of the materials available for insect mesh and has excellent resistance to corrosion. Stainless steel insect mesh keeps out flies, wasps, bees, mosquitoes and other insects, but not midges. Priced by the meter, cut from a roll 1.22 m wide, shipped as a single piece of mesh in the number of meters specified.