Flux-Cored Self-Shielded. Innershield® NR-211®-MP is a versatile wire suitable for all-position welding of light gauge or thin plate. A versatile wire suitable for all-position welding of light gauge or thin plate. Recommended for maximum plate thicknesses in the range of 7.9 mm (5/16 in) to 12.7 mm (1/2 in).