Original: Dewalt OEM N503684 Angle Grinder Int Retaining Ring DWE4120FN DCG413FR2 DCG413FB Optimized: DeWalt Angle Grinder Internal Retaining Ring - OEM Part N503684 - Compatible with DWE4120FN, DCG413FR2, DCG413FB - Perfect for Power Tool Repairs & Maintenance (Note: I kept "DeWalt" as the correct brand capitalization, expanded abbreviations like "Int" to "Internal," added compatibility details, and included a use case for SEO optimization.)