The 3M™ Speedglas™ Welding Helmet 9002NC is a welding helmet designed for rugged, dependable protection.The 3M Speedglas Welding Helmet Outside Protection Plate is a replacement part for the 3M Speedglas Welding Helmet 9002NC. It is designed to protect the filter from spark and spatter. Failure to use an outside protection plate with the filter voids the warranty if spark or spatter contaminates the glass.